【单选题】( )应具备各类站线、站台、雨棚、天桥、地道、照明、给排水,棚栏( 围墙 ),跨线路的平过道和垃圾处理等设施。管规207
【单选题】在 Oracle 中,下面那条语句当 Comm 字段为空时显示 0 ,不为空时显示 Comm 的值()
A.
select ename, NVL(comm,0) from emp;
B.
select ename, NULL(comm,0) from emp;
C.
select ename, NULLIF(comm,0) from emp;
D.
select ename, NVL2(comm,0) from emp;
【单选题】在Oracle中,下面哪条语句当COMM字段为空时显示0,不为空时显示COMM的值( )
A.
SELECT ename,NVL(comm,0) FROM emp;
B.
SELECT ename,NULL(comm,0) FROM emp
C.
SELECT ename,NULLIF(comm,0) FROM emp;
D.
SELECT ename,DECODE(comm,NULL,0) FROM emp;
【单选题】In inter-gender communication when responding to hearing of someone else’s problems, ________
A.
Men tend to respond to hearing of someone else’s problems by telling of their own problems.
B.
Women tend to show that they understand the situation the other person is in and that they feel sympathetic.
C.
Women are more likely to take it as a request for help.
D.
Women tend to offer a solution, however pointless the solution might be.
【单选题】函数 的间断点为 则此函数的间断点类型为( )
【单选题】若f(x)为奇函数,且f'(0)存在,则x=0是函数 的( )。
【单选题】函数【图片】的第二类间断点的个数为( )
【单选题】Gender is mostly a category of the noun and pronoun. In English, the gender distinctions are determined ______ in French, they are ______.
A.
grammatically arbitrary
B.
free determined by the biological gender
D.
by the biological gender grammatical
【单选题】在Oracle中,下面哪条语句当COMM字段为空时显示0,不为空时显示COMM的值?
A.
select ename, nvl(comm,0) from emp;
B.
select ename, null(comm,0) from emp;
C.
select ename,nullif(comm,0)FROM emp;
D.
select ename,decode(comm,NULL,0)FROM emp;