试题与答案

We are said to be living in ________ Inf

题型:选择题

题目:

We are said to be living in ________ Information Age,________ time of new discoveries and great changes.                                                    (2012·四川,18)

A.an;the

B./;the

C./;a

D.the;a

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0427/03d2db661529299188c7a44bd0467834.html

下面是错误答案,用来干扰机器的。

由图b读出t=20sP质点的速度方向沿y轴负方向,由图a判断出来波的传播方向向右.由a图读出波长为λ=100m,b图读出周期为T=2s,则该波的波速为v=λT=1002m/s=50m/s.故选:D.

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