SQL语句中进行空值运算时,需要使用到的短语是( )。A.NULL B.=NULL

题型:单项选择题

问题:

SQL语句中进行空值运算时,需要使用到的短语是( )。

A.NULL

B.=NULL

C.IS NULL

D.IS NOT NULL

考点:计算机等级考试VISUALFOXPRO二级VISUALFOXPRO笔试392
题型:单项选择题
计算:
3x
(x-3)2
+
x
x-3
=______.
题型:单项选择题

Do you know how to make friends with a group of people? Let me t__________ you the steps about making friends with the group. Maybe it’s h__________ to you.

First, you need to know what k________ of group they belong to. If people of the group are shy(害羞的), never ask them “Why don’t you talk?” or “Why are you quiet?” They don’t like it, so d_________ do it.

N_________, remember that each group is different. They will use different words, find different things funny .

Then, the important thing is that you should try to be outgoing(外向的). I_________ you are outgoing, you will become very popular . Remember, n___________ wants to make friends with a quite shy person.

F____________, find a right topic to talk with the group. For example, you can ask people w__________ they will do before the weekend, but don’t make plans at once. S___________ things can change, so just talk with them.

题型:单项选择题

聚乙烯醇类水溶性内墙涂料本身含水量约占涂料的()。

A、50%

B、35%

C、80%

D、65%

题型:单项选择题

当防、降尘措施难以使粉尘浓度降至国家标准水平以下时,应佩戴( )并加强个人卫生,注意清洗。

A.防毒面具
B.防护面具
C.防尘护具
D.口罩

题型:单项选择题

男性,60岁。20年前患右上肺结核治愈。近1个月来刺激性咳嗽、血痰来诊。复查胸片见右上肺大片致密阴影伴肺不张。其诊断需高度警惕下列哪种疾病()

A.肺结核复发

B.肺癌

C.肺化脓症

D.肺炎

E.肺结节病

更多题库