程序运行时,用户向文本框输入内容时,将触发文本框的( )事件。A.Click B.

题型:单项选择题

问题:

程序运行时,用户向文本框输入内容时,将触发文本框的( )事件。

A.Click

B.Db1Click

C.GotFocus

D.Change

考点:计算机等级考试VISUALBASIC二级VISUALBASIC笔试371
题型:单项选择题

朱丹溪认为相火寄于

A.肝

B.脾

C.心

D.肾

E.命门

题型:单项选择题
先化简,再求值:
x-3
x-2
÷(x+2-
5
x-2
)
,其中x=
2
-3
题型:单项选择题

Accidents happen almost every day. Some accidents are not serious and some are. We read about such accidents nearly every day in the newspapers. It is wrong for people to think that accidents take place only on the roads or highways, or even at work places. Home accidents are just as common. Because very few home accidents are reported, people come to think that there are few accidents which happen in homes.

There have been many cases where people fall to their deaths from high rise flats. Children often fall over while coming down the stairs. Old people may slip (滑跤) on wet floors if they are not careful.

Nowadays there are a lot of modern electrical appliances (电器) such as rice cookers which make life easy for the modern house wives. These appliances can kill if they are not used in the proper way. Gas stoves (煤气灶) used for cooking are also dangerous if they are not properly used. They may cause burns or, in more serious cases, even fires.

But all such accidents can be stopped if we are careful and follow simple rules of safety. For example, it is unwise for people to try repairing their own electrical appliances if they do not know how to. It is safer to get them repaired by an electrician (电工).

小题1:Accidents take place ____.

A.mostly in homes

B.mostly on roads and highways

C.mostly in factories

D.almost everywhere小题2:Which of the following accidents may NOT happen in homes?

A.People may fall to death from high buildings.

B.People may be knocked down by cars on the roads.

C.Gas stoves may cause burns or even fires.

D.People may be killed by an electrical appliance.小题3:People are advised____ .

A.to avoid using electrical appliances

B.to repair their own electrical appliances

C.not to repair their own electrical appliances

D.not to get their electrical appliances fixed

题型:单项选择题

我国北方发电厂多为火力发电,某发电厂周围居民区的空气污染物(颗粒物和二氧化硫)年平均浓度超过大气卫生标准。

由此可知我国当前城市大气中的SO2污染来源主要是

A.煤的燃烧

B.汽油的燃烧

C.柴油的燃烧

D.液化石油气的燃烧

E.天然气的燃烧

题型:单项选择题

热压灭菌法温度(蒸汽表压)与时间的关系:115℃(67kPa)需

A.15min
B.20min
C.30min
D.35min
E.40min

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