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【单选题】
下列说法中 不正确 的是( )
A.
在静电场中沿电场线方向的各点电势一定不相等,场强大小一定不相等
B.
在静电场中沿电场线方向的各点电势一定降低,场强大小不一定相等
C.
在静电场中同一等势面上各点电势一定相等,场强大小不一定相等
D.
在静电场中,点电荷q沿任意路径从a点移至b点,只要a、b在同一等势面上,则电场力一定不做功
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参考答案：
举一反三
【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 _________.
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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')) );
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
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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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【单选题】张女士,75岁,体型肥胖,平素不喜运动。2年前因行走后左膝关节疼痛到医院检查,诊断为“骨关节炎”1日前外出时站立不稳跌倒,头部着地,送至医院治疗。张女士目前应做的检查为
A.
头部CT检查
B.
头部X线检查
C.
心电图检查
D.
血常规检查
E.
关节X线检查
查看完整题目与答案
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')) );
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
【单选题】张女士,75岁,体型肥胖,平素不喜运动。2年前因行走后左膝关节疼痛到医院检查,诊断为“骨关节炎”1日前外出时站立不稳跌倒,头部着地,送至医院治疗。张女士目前应做的检查为
A.
头部CT检查
B.
头部X线检查
C.
心电图检查
D.
血常规检查
E.
关节X线检查
查看完整题目与答案
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