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【单选题】
可用来制造厚度>400mm的大型塑料模具,如电视机外壳、洗衣机面板等注射模的钢种是
A.
P20
B.
P4410
C.
718
D.
8Cr2MnWMoVS
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【简答题】Wi-Fi的网络安全机制有 和 两种。
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【单选题】Which of the followings is a numeric commercial book identifier?
A.
ISBN
B.
ISSN
C.
DOI
D.
IDS
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【简答题】A computer’s main memory consists of numerous memory cells, each of which contains ________ bits. Each memory cell is identified by a numeric value called the cell’s _________.
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【简答题】Which of the following systems is least efficient when encoding numeric values?A. Excess notation B. ASCII C. two's complement D. floating-point
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【单选题】Given the following requirements: Create a table to contain employee data, with a unique numeric identifier automatically assigned when a row is added, has an EDLEVEL column that permits only the valu...
A.
CREATE TABLE emp ( empno SMALLINT NEXTVAL GENERATED ALWAYS AS IDENTITY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, workdept CHAR(3) NOT NULL, edlevel CHAR(1), PRIMARY KEY emp_pk (empno), FOREIGN KEY emp_workdept_fk ON (workdept) REFERENCES department (deptno), CHECK edlevel_ck VALUES (edlevel IN ('C','H','N')), );
B.
CREATE TABLE emp ( empno SMALLINT NOT NULL GENERATED BY DEFAULT AS IDENTITY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, workdept CHAR(3), edlevel CHAR(1), CONSTRAINT emp_pk PRIMARY KEY (empno), CONSTRAINT emp_workdept_fk FOREIGN KEY (workdept) REFERENCES department (deptno), CONSTRAINT edlevel_ck CHECK edlevel VALUES ('C','H','N') );
C.
CREATE TABLE emp ( empno SMALLINT NEXTVAL GENERATED BY DEFAULT AS IDENTITY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, workdept CHAR(3) NOT NULL, edlevel CHAR(1) CHECK IN ('C','H','N')), CONSTRAINT emp_pk PRIMARY KEY (empno), CONSTRAINT emp_workdept_fk FOREIGN KEY department (deptno) REFERENCES (workdept) );
D.
CREATE TABLE emp ( empno SMALLINT NOT NULL GENERATED BY DEFAULT AS IDENTITY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, workdept CHAR(3), edlevel CHAR(1), CONSTRAINT emp_pk PRIMARY KEY (empno), CONSTRAINT emp_workdept_fk FOREIGN KEY (workdept) REFERENCES department (deptno), CONSTRAINT edlevel_ck CHECK (edlevel IN ('C','H','N')) );
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【判断题】重要资料和重要机密资料应定期备份,并做好备份检查和资料可用性检查,以便及早发现问题及早修复。
A.
正确
B.
错误
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【单选题】Which of the followings is a numeric commercial book identifier?
A.
ISBN
B.
ISSN
C.
DOI
查看完整题目与答案
【多选题】Wi-Fi的网络安全机制有( )和( )两种。
A.
重发机制
B.
认证机制
C.
转发机制
D.
加密机制
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【单选题】汉译英：“水渍险”，正确的翻译为( )。
A.
Free from PartiCular Average
B.
All Risks
C.
Fire of Marine Average
D.
With Particular Average
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【单选题】Which of the following is the correct way of declaring variables?
A.
numeric<> Salary;
B.
Salary numeric;
C.
float 23.90;
D.
float salary
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相关题目：
【简答题】Wi-Fi的网络安全机制有 和 两种。
查看完整题目与答案
【单选题】Which of the followings is a numeric commercial book identifier?
A.
ISBN
B.
ISSN
C.
DOI
D.
IDS
查看完整题目与答案
【简答题】A computer’s main memory consists of numerous memory cells, each of which contains ________ bits. Each memory cell is identified by a numeric value called the cell’s _________.
查看完整题目与答案
【简答题】Which of the following systems is least efficient when encoding numeric values?A. Excess notation B. ASCII C. two's complement D. floating-point
查看完整题目与答案
【单选题】Given the following requirements: Create a table to contain employee data, with a unique numeric identifier automatically assigned when a row is added, has an EDLEVEL column that permits only the valu...
A.
CREATE TABLE emp ( empno SMALLINT NEXTVAL GENERATED ALWAYS AS IDENTITY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, workdept CHAR(3) NOT NULL, edlevel CHAR(1), PRIMARY KEY emp_pk (empno), FOREIGN KEY emp_workdept_fk ON (workdept) REFERENCES department (deptno), CHECK edlevel_ck VALUES (edlevel IN ('C','H','N')), );
B.
CREATE TABLE emp ( empno SMALLINT NOT NULL GENERATED BY DEFAULT AS IDENTITY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, workdept CHAR(3), edlevel CHAR(1), CONSTRAINT emp_pk PRIMARY KEY (empno), CONSTRAINT emp_workdept_fk FOREIGN KEY (workdept) REFERENCES department (deptno), CONSTRAINT edlevel_ck CHECK edlevel VALUES ('C','H','N') );
C.
CREATE TABLE emp ( empno SMALLINT NEXTVAL GENERATED BY DEFAULT AS IDENTITY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, workdept CHAR(3) NOT NULL, edlevel CHAR(1) CHECK IN ('C','H','N')), CONSTRAINT emp_pk PRIMARY KEY (empno), CONSTRAINT emp_workdept_fk FOREIGN KEY department (deptno) REFERENCES (workdept) );
D.
CREATE TABLE emp ( empno SMALLINT NOT NULL GENERATED BY DEFAULT AS IDENTITY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, workdept CHAR(3), edlevel CHAR(1), CONSTRAINT emp_pk PRIMARY KEY (empno), CONSTRAINT emp_workdept_fk FOREIGN KEY (workdept) REFERENCES department (deptno), CONSTRAINT edlevel_ck CHECK (edlevel IN ('C','H','N')) );
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【判断题】重要资料和重要机密资料应定期备份,并做好备份检查和资料可用性检查,以便及早发现问题及早修复。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Which of the followings is a numeric commercial book identifier?
A.
ISBN
B.
ISSN
C.
DOI
查看完整题目与答案
【多选题】Wi-Fi的网络安全机制有( )和( )两种。
A.
重发机制
B.
认证机制
C.
转发机制
D.
加密机制
查看完整题目与答案
【单选题】汉译英：“水渍险”，正确的翻译为( )。
A.
Free from PartiCular Average
B.
All Risks
C.
Fire of Marine Average
D.
With Particular Average
查看完整题目与答案
【单选题】Which of the following is the correct way of declaring variables?
A.
numeric<> Salary;
B.
Salary numeric;
C.
float 23.90;
D.
float salary
查看完整题目与答案