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问题

For occasional heavy loads, two cranes can be arranged to work togetherThe operating _____


For occasional heavy loads, two cranes can be arranged to work togetherThe operating _____ for deck crane motors may be hydraulic electric.

A.principle

B.medium

C.instruction

D.voltage

请帮忙给出正确答案和分析,谢谢!

参考答案
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