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【单选题】
The car salesman took the customer for a drive in the new model in order to ______its improved features.
A.
admit
B.
reveal
C.
demonstrate
D.
indicate
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【单选题】下列离子在水溶液中有颜色的是（）
A.
Ac 3+
B.
Th 4+
C.
PaO 2+
D.
Np 3+
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【单选题】一粗牙普通螺纹，公称直径20，螺距2.5，右旋，中、顶径公差带代号6g,旋入长度代号为L。查表写出螺纹的规定代号。
A.
M20 -6g-L
B.
M20x2.5 -6g-L
C.
M20x2.5 -6g6g-L
D.
M20 -6g
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【多选题】Choose the suitable words from below and fill A, B, C......or O in each blank.
A.
resources
B.
other
C.
best
D.
As
E.
entertain
F.
take
G.
thinking
H.
mental
I.
cool
J.
reason K. performance L. wet M. next N. environmentally O. rest If you are like most people, your intelligence varies from season to season. You are probably a lot sharper in spring than you are at any _____1____ time of the year. Spring appears to be the _____2 ____ period of the year for thinking. One _____3 ____ may be that in spring man's _____4 ____ powers are affected by the same factors that bring about great changes in all nature. Autumn is the _____5 ____ best season, then winter. _____6 ____ for summer, it seems to be a good time to _____ 7____ a long vacation from thinking! It has been found that _____8 ____ weather is much more favorable for creative _____ 9____ than is summer heat. This does not mean that all people are less intelligent in summer than they are during the _____10 ____ of the year. It does mean, however, that the mental powers of large numbers of people tend to be lowest in summer.
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【单选题】Here’s my card. Let’s keep in ________.2
A.
touch
B.
relation
C.
connection
D.
friendship
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【单选题】在含有下列离子的溶液中,加入 NaCl 溶液生成白色沉淀,再加入氨水变黑的是()。
A.
Ag +
B.
Hg 2 2+
C.
Pb 2+
D.
Hg 2+
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【单选题】下列各组离子在给定溶液中可能大量共存的是 [     ]
A.
向无色溶液中加氯水，溶液变为橙色：SO 4 2- 、Br - 、NO 3 - 、Ag +
B.
使酚酞试液变红的溶液中：K + 、Na + 、NH 4 + 、HCO 3 -
C.
向其中加铝粉有氢气放出的溶液中：K + 、Na + 、H + 、NO 3 -
D.
在常温下，水电离出的c(H + )= 10 -13 mol/L的溶液中：Na + 、AlO 2 - 、CO 3 2- 、SO 3 2-
查看完整题目与答案
【单选题】机车分为电力机车车和()。
A.
蒸汽机车
B.
乘务机车
C.
内燃机车
D.
调车机车
查看完整题目与答案
【单选题】对下列各种溶液中大量共存离子的判断合理的是（　　）
A.
向无色溶液中加氯水，溶液变为橙色，溶液中一定有：SO 4 2- 、Br - 、NO 3 - 、Ag +
B.
使酚酞试液变红的溶液中可能有：K + 、Na + 、NH 4 + 、HCO 3 -
C.
在水电离出的c（H + ）=10 -5 mol/L的溶液中可能有：Na + 、AlO 2 - 、CO 3 2- 、SO 3 2-
D.
向溶液中加铝粉有氢气放出，则该溶液中一定有：K + 、Na + 、H + 、NO 3 -
查看完整题目与答案
【单选题】机车分为电力机车和(D)。
A.
调车机车
B.
蒸汽机车
C.
乘务机车
D.
内燃机车
查看完整题目与答案
【多选题】下列离子在水溶液中有色的是 ( )
A.
Cu 2+
B.
Fe 3+
C.
Zn 2+
D.
Cr 3+
E.
Mn 2+
查看完整题目与答案
相关题目：
【单选题】下列离子在水溶液中有颜色的是（）
A.
Ac 3+
B.
Th 4+
C.
PaO 2+
D.
Np 3+
查看完整题目与答案
【单选题】一粗牙普通螺纹，公称直径20，螺距2.5，右旋，中、顶径公差带代号6g,旋入长度代号为L。查表写出螺纹的规定代号。
A.
M20 -6g-L
B.
M20x2.5 -6g-L
C.
M20x2.5 -6g6g-L
D.
M20 -6g
查看完整题目与答案
【多选题】Choose the suitable words from below and fill A, B, C......or O in each blank.
A.
resources
B.
other
C.
best
D.
As
E.
entertain
F.
take
G.
thinking
H.
mental
I.
cool
J.
reason K. performance L. wet M. next N. environmentally O. rest If you are like most people, your intelligence varies from season to season. You are probably a lot sharper in spring than you are at any _____1____ time of the year. Spring appears to be the _____2 ____ period of the year for thinking. One _____3 ____ may be that in spring man's _____4 ____ powers are affected by the same factors that bring about great changes in all nature. Autumn is the _____5 ____ best season, then winter. _____6 ____ for summer, it seems to be a good time to _____ 7____ a long vacation from thinking! It has been found that _____8 ____ weather is much more favorable for creative _____ 9____ than is summer heat. This does not mean that all people are less intelligent in summer than they are during the _____10 ____ of the year. It does mean, however, that the mental powers of large numbers of people tend to be lowest in summer.
查看完整题目与答案
【单选题】Here’s my card. Let’s keep in ________.2
A.
touch
B.
relation
C.
connection
D.
friendship
查看完整题目与答案
【单选题】在含有下列离子的溶液中,加入 NaCl 溶液生成白色沉淀,再加入氨水变黑的是()。
A.
Ag +
B.
Hg 2 2+
C.
Pb 2+
D.
Hg 2+
查看完整题目与答案
【单选题】下列各组离子在给定溶液中可能大量共存的是 [     ]
A.
向无色溶液中加氯水，溶液变为橙色：SO 4 2- 、Br - 、NO 3 - 、Ag +
B.
使酚酞试液变红的溶液中：K + 、Na + 、NH 4 + 、HCO 3 -
C.
向其中加铝粉有氢气放出的溶液中：K + 、Na + 、H + 、NO 3 -
D.
在常温下，水电离出的c(H + )= 10 -13 mol/L的溶液中：Na + 、AlO 2 - 、CO 3 2- 、SO 3 2-
查看完整题目与答案
【单选题】机车分为电力机车车和()。
A.
蒸汽机车
B.
乘务机车
C.
内燃机车
D.
调车机车
查看完整题目与答案
【单选题】对下列各种溶液中大量共存离子的判断合理的是（　　）
A.
向无色溶液中加氯水，溶液变为橙色，溶液中一定有：SO 4 2- 、Br - 、NO 3 - 、Ag +
B.
使酚酞试液变红的溶液中可能有：K + 、Na + 、NH 4 + 、HCO 3 -
C.
在水电离出的c（H + ）=10 -5 mol/L的溶液中可能有：Na + 、AlO 2 - 、CO 3 2- 、SO 3 2-
D.
向溶液中加铝粉有氢气放出，则该溶液中一定有：K + 、Na + 、H + 、NO 3 -
查看完整题目与答案
【单选题】机车分为电力机车和(D)。
A.
调车机车
B.
蒸汽机车
C.
乘务机车
D.
内燃机车
查看完整题目与答案
【多选题】下列离子在水溶液中有色的是 ( )
A.
Cu 2+
B.
Fe 3+
C.
Zn 2+
D.
Cr 3+
E.
Mn 2+
查看完整题目与答案