When the derrick is topped, the guy must be （）(放松).A、slacked offB、sent awayC、sent outD、taken in
When the derrick is topped, the guy must be （）(放松).
- A、slacked off
- B、sent away
- C、sent out
- D、taken in
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
起货机出故障时，水手要去叫电工来修理。（）A、When the windlass is in trouble, the sailor must go and call the electrician to repair it.B、When the derrick is in trouble, the sailor must go and call the electrician to repair it.C、When the winch is in trouble, the sailor must go and call the electrician to repair it.D、When the winch is in trouble, the sailor must go and call the carpenter to repair it.
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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When the derrick changes its （）(角度), its lifting capacity changes correspondingly.AangelBlengthCheightDangle
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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.