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.
单选题
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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