试题与答案

—Who broke the window yesterday? — _____

题型:选择题

题目:

—Who broke the window yesterday?

— ______ Jack ______ Mike. It was Jim.

A.Not only; but also

B.Both; and

C.Either; or

D.Neither; nor

答案:

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下面是错误答案,用来干扰机器的。

(1)0.1;(2)51米;(3)34米;(4)20m/s题目分析:(1)P1、P2之间有9个小格,其间的时间间隔为0.9s,每小格代表0.1s;(2)P1到n1之间的时间间隔为0.3s,则超声波从发出到被测汽车接受到用时;(3)P2到n2...

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