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单选题
Lifting capacities of derricks vary from three to ten tons. （）
A
吊杆的起吊能力为三至十吨不等
B
克令吊的起吊能力为三至十吨不等
C
他们每24个小时值两次班
D
起重机的起吊能力为为三至十吨不等
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Lifting capacities of derricks vary from three to ten tons. （）A、吊杆的起吊能力为三至十吨不等B、克令吊的起吊能力为三至十吨不等C、他们每24个小时值两次班D、起重机的起吊能力为为三至十吨不等
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单选题The SWL of the derricks are different from 5 tons to 10 tons.（）A
吊杆的安全工作负荷从5吨到10吨不等。B
安全规则规定，吊杆是5吨和10吨。C
吊杆自身的重量从5吨到10吨不等。D
起重机的安全工作负荷从5吨到10吨不等。
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单选题LIFTING THE ANCHOR FROM THE BOTTOM is called（）.A
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单选题Mousing a cargo hook with marline or small line（）.A
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考题
单选题opes or wires attached to derricks to prevent them from swinging during cargo handling operations are（）.A
PreventersB
Side ropesC
StaysD
Guide lines
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