以下属于高压开关柜优点的是（）。
A．占地面积小
B．易于调换新柜
C．便于操作
D．维修方便
参考答案：B
The new bridge is ____the one built last year.
A．three times as wider as
B．three times the width of
C．three times the width
D．as three times as
连杆杆身通常做成（）形状
A、梯形
B、长方形
C、工字形
