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When the derrick is topped, the guys must be （）.
- A、slacked off
- B、send away
- C、taken in
- D、send out
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单选题这个吊杆的安全工作负荷是6吨。（）A
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单选题When the derrick is stopped, the guy must be （）(收好).A
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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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