起重机电路图包括原理图、()图和外部接线图。
参考答案:安装
—Do you want to go to the movies with me?
— . [ ]
A. Sure, this TV show is boring.
B. That's all right.
C. That's right.
D. You're welcome
紧急电话系统由()三部分组成。
A.紧急电话控制台
B.传输线路
C.紧急电话分机
D.电话员
E.分机电话亭