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单选题
For occasional heavy loads, two cranes can be arranged to work together. The operating （） for deck crane motors may be hydraulic electric.
A
principle
B
medium
C
instruction
D
voltage
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can be released while under strainB
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考题
单选题For occasional heavy loads, two cranes can be arranged to work together. The operating （） for deck crane motors may be hydraulic electric.A
principleB
mediumC
instructionD
voltage
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