安装接线图标明了屏柜上（）
A.各个元件的代表符号
B.各个元件的顺序号
C.每个元件引出端子之间的连接情况
D.以上说法都不对
参考答案：A, B, C
I go to school foot.[ ]
A. on
B. in
C. by
Your smile is one of the strongest tools that make ______ possible for you to meet new people.
A．it
B．them
C．this
D．/
