试题与答案

如图所示是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

题目:

如图所示是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.10Hz,5A

B.10Hz,10A

C.5Hz,5A

D.5Hz,10A

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A, B, C, D, E

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题型:阅读理解

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a. leaves  b. bananas   c.meat  d. elephant  e. camel  f. monkey  g. giraffe  h. lion  i. river  j. tree

Jenny and Danny go to the zoo.Jenny sees an1. _____ Danny sees a2._____ in a cage.It is eating3. _____ Then they watch a 4._____ near a 5. ______.  At last they see a6._____ in a7._____.  It's Jenny's favourite animal.She wants to buy some 8.______ to feed it. WhatdoesDannywanttodo? Dannysays, " Let'sgotoseethe9.____. I have some

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( ) 11. Danny and Jenny see five animals at the zoo.

(     ) 12. Danny and Jenny are on a farm.

( ) 13. The lion is in a cage.

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