电力线杆塔按功能可分为（）。
A、直线塔
B、耐张塔
C、转角塔
D、水泥塔
参考答案：A, B, C
His parents wouldn’t let him marry anyone ______ family was poor.
A．of whom
B．whom
C．of whose
D．whose
车间布置设计的内容可分成两大部分。
