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单选题
Which system(s) in the hydraulic systems of crane always hold(s) single side of load?（）
A
hoisting system only
B
hoisting system and luffing system
C
hoisting system and slew and slewing system
D
slewing system only
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单选题Which system(s) in the hydraulic systems of crane always hold(s) single side of load?（）A
hoisting system onlyB
hoisting system and luffing systemC
hoisting system and slew and slewing systemD
slewing system only
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Animal oilC
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Electro-hydraulic unitsB
Steam unitsC
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Bunkering barge alongsideB
Potable water spill on deckC
Crane hydraulic hose burstsD
Trim greater than 4 feet
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Constant tension mooring winch systemB
Hatch cover systemC
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Internal combustion engine hydraulic starter system
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单选题Which of the following types of hydraulic pumps would be used in a steering system?（）A
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ScrewC
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Volute
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