电路中每个分支被称为（）。
A、支路
B、回路
C、旁路
D、分路
参考答案：A
当建筑层高大于______m时，一般从上向下抹灰。
A．5.2
B．4.2
C．3.2
D．2.2
In my opinion, life in the twenty-first century is much easier than _____. [ ]
A. that used to be
B. it is used to
C. it was used to
D. it used to be
