单项选择题
A. work B. to work C. working D. job
You can swing the derrick to starboard side or port sid...
单项选择题You can swing the derrick to starboard side or port side. But do not exceed （）for the union purchase.
A.120° B.90° C.60° D.100°
When the derrick is lowered, the guys must be （）.A. sla...
单项选择题When the derrick is lowered, the guys must be （）.
A. slacked off B. taken in C. send away D. send out
When the derrick is topped, the guys must be （）.A. slac...
单项选择题When the derrick is topped, the guys must be （）.
A. slacked off B. send away C. taken in D. send out
