下图是一正弦交变电流的电流图象.此正弦交变电流的频率和电流的有效值分别为( )

题型:选择题

问题:

下图是一正弦交变电流的电流图象.此正弦交变电流的频率和电流的有效值分别为(  )

A.5Hz,10A

B.50Hz,10A

C.50Hz,10 A

D.5Hz,10 A

考点:交变电流的周期和频率交变电流的最大值、有效值、瞬时值和平均值
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On Keeping a Diary in English
Keeping a diary in English is one of the effective ways to improve our English writing ability.  Compared with other forms of writing, it is  36  and takes less time. It can help us to develop the habit of thinking in English.   37 we stick to this practice, gradually, we'll learn how to express ourselves in English.  In keeping a diary in English, we   38 run up against a lot of difficulties. In the first place, it happens that we have trouble in   39 appropriate words and phrases to give expression to 40 mind. Secondly, there are many idiomatic ways of saying things in Chinese. And it is extremely   41  for us to put them into English properly. Surely, there are some other roadblocks we may come across  42 keeping a diary in English.
As far as I am concerned, my suggestion is that we should always have a(n)   43  and a Chinese-English dictionary within easy   44  . Whenever something beats us, we can put it down in our notebook and then consult our dictionary. We can also  45  to English teachers for help, if necessary. In short, I believe that it is of great use to keep a diary in English for the development of our writing skills.
小题1:
A.longerB.shorterC.thickerD.better
小题2:
A.WhetherB.IfC.WhenD.Which
小题3:
A.mayB.mustC.shouldD.could
小题4:
A.foundB.findingC.to findD.find
小题5:
A.usB.weC.ourD.ours
小题6:
A.easyB.hardC.goodD.bad
小题7:
A.inB.toC.withD.on
小题8:
A.penB.backpackC.eraserD.notebook
小题9:
A.handB.sightC.reachD.ability
小题10:
A.runB.turnC.flyD.come
题型:选择题

下述哪项不是心脏萎缩的肉眼特点()

A.体积小

B.呈褐色

C.心肌质地硬韧

D.心脏表面血管弯曲

E.心脏表面血管增粗

题型:选择题

以下哪项符合急性风湿热的次要表现()

A.ASO>500U

B.心脏炎

C.发热

D.舞蹈病

E.多关节炎

题型:选择题

下列各项中,不属于其他用工的是( )。

A.超运距用工
B.基本用工
C.人工幅度差
D.辅助用工

题型:选择题

下列各项中,属于违反支付结算规定的行为有( )。

A.银行对到期的票据故意压票、拖延支付的

B.出票人签发无资金保证的汇票、本票

C.单位签发空头支票

D.出租、出借银行结算账户

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