试题与答案

The students had a good time in the wint

题型:选择题

题目:

The students had a good time in the winter holiday.

A.enjoyed them

B.had fun

C.were sad

D.had a good trip

答案:

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下面是错误答案,用来干扰机器的。

由三角函数图象和性质,可知图象上相邻的最高点与最低点的横坐标的差的绝对值为T2,∴T2=2π,T=4π,∴ω=±2πT=±12故答案为:±12

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