两个电流随时间的变化关系如图甲、乙所示,把它们通入相同的电阻中,则在1s内两电阻

题型:选择题

问题:

两个电流随时间的变化关系如图甲、乙所示,把它们通入相同的电阻中,则在1s内两电阻消耗的电功之比WaWb等于

[ ]

A.1:

B.1:2        

C.1:4          

D.1:1

考点:交变电流的图像
题型:选择题

在窗体上画一个列表框和一个命令按钮,其名称分别为List1和Command1,然后编写如下事件过程: Private Sub Form_Load()List1. AddItem"Item1"List1.AddItem"Item2"List1. AddItem"Item3" End Sub Private Sub Command1_Click()List1. List(List1. ListCount)="AAAA" End Sub 程序运行后,单击命令按钮,其结果为______。

A.把字符串“AAAA”添加到列表框中,但位置不能确定

B.把字符串“AAAA”添到列表框的最后(即“Item3”的后面)

C.把列表框之中原有的最后一项改为“AAAA”

D.把字符串“AAAA”插入到列表框的最前面(即“Iteml”的前面)

题型:选择题

根据短文内容,判断文后句子的正确(T)与错误(F)。

     "How are you?" is a nice question. It's a friendly way that people in the U.S.A greet each other. But "How

are you?" is also a very unusual question. It's a question that often doesn't need an answer. The person who

asks" How are you?" hopes to hear the answer "Fine", even if the person's friend isn't fine. The reason is that

"How are you?" isn't really a question and "Fine" isn't really an answer. They are simply other ways of saying

"Hello" or "Hi".

     Sometimes, people also don't say exactly what they mean. For example, when someone Asks "Do you

agree?", the other person might think, "No, I disagree. I think you're Wrong..."But it isn't very polite to disagree

so strongly, so the other person might say "I'm not sure." It's a nicer way to say that you don't agree with

someone.

     People also don't say exactly what they are thinking when they finish talking with other people. For

example, many talks over the phone finish when one person say"I've to go now." Often, the person who

wants to hang up gives and excuse:"Someone's at the door.""Something is burning on the stove." The excuses

might be real, or not. Perhaps the person who wants to hang up simply doesn't want to talk any more, but it

isn't polite to say that. The excuse is more polite, and it doesn't hurt the other person.

     Whether they are greeting each other, talking about an idea, of finishing a talk, people don't say exactly

that they are thinking. It's an important way that people try to be nice to each other, and it's part of the game

of language.

( )1. "How are you?" is another way of saying "Hello." or" Hi."                                                       

( )2. It is polite lo say "No. I disagree I think you are wrong," if you don't agree with others.                    

( )3. When someone says "I have to go now "On the phone. it means he wants to go on talking.  

( )4. "Someone is at the door." may be an excuse for finishing a plume can.                                           

( )5. Sometimes people don't say exactly what they are thinking about just became they try to be nice

            to each other. 

题型:选择题

下列说法正确的是()。

A.国际上公认的较好的资产负债率指标是80%

B.国际公认的流动比率标准是200%

C.国际公认的标准速动比率是60%

D.资产负债率不是评价企业负债水平的综合指标

题型:选择题

THDS-A探测系统中光子探头适应的车速为()

A.5~160km/h

B.50~160km/h

C.5~360km/h

D.50~360km/h

题型:选择题

向综采工作面移动变电站供电的电缆型号应为()。

A、UCPT

B、UGSP

C、UCPJB

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