钢筋混凝土净保护层厚度不小于（）cmA、6B、7C、8_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

钢筋混凝土净保护层厚度不小于（）cm

A、6

B、7

C、8

答案

参考答案：B

补全对话，情景问答

给下列的问句选择对应的答语。

( ) 1. Is Mike drawing pictures?
( ) 2. What's he doing?
( ) 3. What are they doing?
( ) 4. When's your birthday?
( ) 5. Do you like spring?

A. He's writing a letter.
B. It's June 20th.
C. No, he isn't.
D. Yes, I do.
E. They're eating lunch.

填空题

振幅键控是正弦载波的（）随数字基带信号而变化的数字调制。