避雷针、避雷网的引下线采用( )制作。
A．镀锌圆钢
B．镀锌角钢
C．镀锌钢绞线
D．镀锌扁钢
参考答案：A,C,D
----Why is he feeling down today?
----Because the suggestion he _______ has been turned down.
A．put away
B．put up
C．put down
D．put forward
观察立管压力变化，记录关井立管压力应是（）的职责。
A.场地工
B.内钳工
C.司钻
D.井架工
