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【简答题】
（14分）常见化学反应方程式A+B X+Y+H 2 O。请回答： (1) 若A为易溶于水的盐，B是强碱，实验室常用此反应制备气体X，写出该反应的化学方程式 ，检查其中气体X的方法是 。 (2) 若A为黑色固体，Y是黄绿色气体，写出Y 的电子式 ，该反应的离子方程式是 。将气体Y通入NaOH溶液中加热发生反应，当消耗6.72L(标准状况)Y气体时，转移0.5mol电子，写出该反应的化学方程式 。 (3) 若A为金属单质，B是稀硝酸，当A与B以物质的量之比为1:4进行反应，生成无色气体X，遇空气立即变为红棕色。且A可溶于Y溶液中。 ①写出该反应的化学方程式 。 ②含0.5molY的溶液溶解了一定量A后，若溶液中两种金属阳离子的物质的量恰好相等，则被还原的Y是 mol。
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【单选题】Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables. She granted SELECT privilege to Scott on this view. Which option enables Scott to eli...
A.
Scott can create a synonym for the EMP_DEPT_LOC_VU bus using the command: CREATE PRIVATE SYNONYM EDL_VU FOR mary.EMP DEPT_LOC_VU; then he can prefix the columns with this synonymn.
B.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE SYNONYM EDL_VU FOR mary.EMP_DEPT_LOC_VU; then he can prefix the columns with this synonym.
C.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE LOCAL SYNONYM EDL_VU FOR mary.EMP DEPT_LOC_VU; then he can prefix the columns with this synonym.
D.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE SYNONYM EDL_VU ON mary(EMP_DEPT_LOC_VU); then he can prefix the columns with this synonym.
E.
Scott cannot create a synonym because synonyms can be created only for tables.
F.
Scott cannot create any synonym for Mary's view. Mary should create a private synonym for the view and grant SELECT privilege on that synonym to Scott.
查看完整题目与答案
【单选题】Select the view with correct dimensioning result. (Single option: 10 points)
A.
(1)
B.
(2)
C.
None
D.
None
查看完整题目与答案
【单选题】Select the view with correct dimensioning result according to the given machining steps. (Single option: 10 points)
A.
(1)
B.
(2)
C.
None
D.
None
查看完整题目与答案
【单选题】Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables. She granted SELECT privilege to Scott on this view. Which option enables Scott to eli...
A.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command CREATE PRIVATE SYNONYM EDL_VU FOR mary.EMP_DEPT_LOC_VU; then he can prefix the columns with this synonym.
B.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command CREATE SYNONYM EDL_VU FOR mary.EMP_DEPT_LOC_VU; then he can prefix the columns with this synonym.
C.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command CREATE LOCAL SYNONYM EDL_VU FOR mary.EMP_DEPT_LOC_VU; then he can prefix the columns with this synonym.
D.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command CREATE SYNONYM EDL_VU ON mary(EMP_DEPT_LOC_VU); then he can prefix the columns with this synonym.
E.
Scott cannot create a synonym because synonyms can be created only for tables.
F.
Scott cannot create any synonym for Mary's view. Mary should create a private synonym for the view and grant SELECT privilege on that synonym to Scott.
查看完整题目与答案
【单选题】Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables. She granted SELECT privilege to Scott on this view. Which option enables Scott to eli...
A.
Scott can create a synonym for the EMP_DEPT_LOC_VU bus using the command:   CREATE PRIVATE SYNONYM EDL_VU   FOR mary.EMP DEPT_LOC_VU;   then he can prefix the columns with this synonymn.
B.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command:   CREATE SYNONYM EDL_VU   FOR mary.EMP_DEPT_LOC_VU;   then he can prefix the columns with this synonym.
C.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command:   CREATE LOCAL SYNONYM EDL_VU   FOR mary.EMP DEPT_LOC_VU;   then he can prefix the columns with this synonym.
D.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command:   CREATE SYNONYM EDL_VU   ON mary(EMP_DEPT_LOC_VU);   then he can prefix the columns with this synonym.
E.
Scott cannot create a synonym because synonyms can be created only for tables.
F.
Scott cannot create any synonym for Mary’s view. Mary should create a private ynonym for the view and grant SELECT privilege on that synonym to Scott.
查看完整题目与答案
【单选题】Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES,DEPARTMENTS, and LOCATIONS tables. She granted SELECT privilege to Scott on this view. Which option enables Scott to elim...
A.
Scott can create a synonym for the EMP_DEPT_LOC_VU bus using the command: CREATE PRIVATE SYNONYM EDL_VU FOR mary. EMP DEPT_LOC_VU; then he can prefix the columns with this synonymn.
B.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE SYNONYM EDL_VU FOR mary. EMP DEPT_LOC_VU; then he can prefix the columns with this synonym.
C.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE LOCAL SYNONYM EDL_VU FOR mary. EMP DEPT_LOC_VU; then he can prefix the columns with this synonym.
D.
Scott cannot create a synonym because synonyms can be created only for tables.
E.
Scott cannot create any synonym for Mary's view. Mary should create a private synonym for the view and grant SELECT privilege on that synonym to Scott.
查看完整题目与答案
【多选题】中兴智能集成多业务路由器产品定位是( )
A.
运营商接入路由器
B.
运营商核心路由器
C.
大中小型企业机构
D.
网吧、校园网、专网等
查看完整题目与答案
【单选题】Select the view with correct dimensioning result. (Single option: 10 points)
A.
(2)
B.
(1)
C.
(3)
D.
None
查看完整题目与答案
【单选题】Select the view with correct dimensioning style. (Single option: 10 points)
A.
(1)
B.
(2)
C.
None
D.
None
查看完整题目与答案
【单选题】Select the view with correct dimensioning result. (Single option: 10 points)
A.
(2)
B.
(1)
C.
None
D.
None
查看完整题目与答案
相关题目：
【单选题】Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables. She granted SELECT privilege to Scott on this view. Which option enables Scott to eli...
A.
Scott can create a synonym for the EMP_DEPT_LOC_VU bus using the command: CREATE PRIVATE SYNONYM EDL_VU FOR mary.EMP DEPT_LOC_VU; then he can prefix the columns with this synonymn.
B.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE SYNONYM EDL_VU FOR mary.EMP_DEPT_LOC_VU; then he can prefix the columns with this synonym.
C.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE LOCAL SYNONYM EDL_VU FOR mary.EMP DEPT_LOC_VU; then he can prefix the columns with this synonym.
D.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE SYNONYM EDL_VU ON mary(EMP_DEPT_LOC_VU); then he can prefix the columns with this synonym.
E.
Scott cannot create a synonym because synonyms can be created only for tables.
F.
Scott cannot create any synonym for Mary's view. Mary should create a private synonym for the view and grant SELECT privilege on that synonym to Scott.
查看完整题目与答案
【单选题】Select the view with correct dimensioning result. (Single option: 10 points)
A.
(1)
B.
(2)
C.
None
D.
None
查看完整题目与答案
【单选题】Select the view with correct dimensioning result according to the given machining steps. (Single option: 10 points)
A.
(1)
B.
(2)
C.
None
D.
None
查看完整题目与答案
【单选题】Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables. She granted SELECT privilege to Scott on this view. Which option enables Scott to eli...
A.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command CREATE PRIVATE SYNONYM EDL_VU FOR mary.EMP_DEPT_LOC_VU; then he can prefix the columns with this synonym.
B.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command CREATE SYNONYM EDL_VU FOR mary.EMP_DEPT_LOC_VU; then he can prefix the columns with this synonym.
C.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command CREATE LOCAL SYNONYM EDL_VU FOR mary.EMP_DEPT_LOC_VU; then he can prefix the columns with this synonym.
D.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command CREATE SYNONYM EDL_VU ON mary(EMP_DEPT_LOC_VU); then he can prefix the columns with this synonym.
E.
Scott cannot create a synonym because synonyms can be created only for tables.
F.
Scott cannot create any synonym for Mary's view. Mary should create a private synonym for the view and grant SELECT privilege on that synonym to Scott.
查看完整题目与答案
【单选题】Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables. She granted SELECT privilege to Scott on this view. Which option enables Scott to eli...
A.
Scott can create a synonym for the EMP_DEPT_LOC_VU bus using the command:   CREATE PRIVATE SYNONYM EDL_VU   FOR mary.EMP DEPT_LOC_VU;   then he can prefix the columns with this synonymn.
B.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command:   CREATE SYNONYM EDL_VU   FOR mary.EMP_DEPT_LOC_VU;   then he can prefix the columns with this synonym.
C.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command:   CREATE LOCAL SYNONYM EDL_VU   FOR mary.EMP DEPT_LOC_VU;   then he can prefix the columns with this synonym.
D.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command:   CREATE SYNONYM EDL_VU   ON mary(EMP_DEPT_LOC_VU);   then he can prefix the columns with this synonym.
E.
Scott cannot create a synonym because synonyms can be created only for tables.
F.
Scott cannot create any synonym for Mary’s view. Mary should create a private ynonym for the view and grant SELECT privilege on that synonym to Scott.
查看完整题目与答案
【单选题】Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES,DEPARTMENTS, and LOCATIONS tables. She granted SELECT privilege to Scott on this view. Which option enables Scott to elim...
A.
Scott can create a synonym for the EMP_DEPT_LOC_VU bus using the command: CREATE PRIVATE SYNONYM EDL_VU FOR mary. EMP DEPT_LOC_VU; then he can prefix the columns with this synonymn.
B.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE SYNONYM EDL_VU FOR mary. EMP DEPT_LOC_VU; then he can prefix the columns with this synonym.
C.
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE LOCAL SYNONYM EDL_VU FOR mary. EMP DEPT_LOC_VU; then he can prefix the columns with this synonym.
D.
Scott cannot create a synonym because synonyms can be created only for tables.
E.
Scott cannot create any synonym for Mary's view. Mary should create a private synonym for the view and grant SELECT privilege on that synonym to Scott.
查看完整题目与答案
【多选题】中兴智能集成多业务路由器产品定位是( )
A.
运营商接入路由器
B.
运营商核心路由器
C.
大中小型企业机构
D.
网吧、校园网、专网等
查看完整题目与答案
【单选题】Select the view with correct dimensioning result. (Single option: 10 points)
A.
(2)
B.
(1)
C.
(3)
D.
None
查看完整题目与答案
【单选题】Select the view with correct dimensioning style. (Single option: 10 points)
A.
(1)
B.
(2)
C.
None
D.
None
查看完整题目与答案
【单选题】Select the view with correct dimensioning result. (Single option: 10 points)
A.
(2)
B.
(1)
C.
None
D.
None
查看完整题目与答案