音机机芯的装配，要求磁头与磁带之间实现（）运动。A、恒速 B、

搜题请搜索小程序“爱下问搜题”

问题单项选择题

音机机芯的装配，要求磁头与磁带之间实现（）运动。

A、恒速

B、随音频变化的

C、变速

D、加速

答案

参考答案：A

选择题

— Has Tom already finished his new story?

一 I have no idea. He _____ it last month. [ ]

A. had written

B. was writing

C. would write

D. wrote

单项选择题

168.1.32/28网络， (48) 上是广播地址，可分配地址为 (49) 。

A．191.168.1.47
B．191.168.1.255
C．191.168.1.1
D．191.168.1.48