When the derrick is topped, the guys must be （）.A、slacked offB、send awayC、taken inD、send out
When the derrick is topped, the guys must be （）.
- A、slacked off
- B、send away
- C、taken in
- D、send out
相关考题：
When the inert gas pressure is being ______ in the cargo tanks，particular attention should be paid to obtaining an oxygen concentration．A.topped upB.bracedC.tommed downD.shored
The connected joints of pipe，usually made of three joints of pipe approximately 90 feet long，racked in the derrick when making a trip are called a ______．A.StringB.StandC.JointD.Standpipe
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吊杆停用时，稳索必须要收起来。（）A、When the derrick is stopped, the guy must be stowed.B、When the derrick is stopped, the guy must be topped.C、When the derrick is stopped, the guy must be lowered.D、When the guy is stopped, the derrick must be stowed.
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单选题吊杆停用时，稳索必须要收起来。（）AWhen the derrick is stopped, the guy must be stowed.BWhen the derrick is stopped, the guy must be topped.CWhen the derrick is stopped, the guy must be lowered.DWhen the guy is stopped, the derrick must be stowed.