单选题Which system(s) in the hydraulic systems of crane always hold(s) single side of load?（）Ahoisting system onlyBhoisting system and luffing systemChoisting system and slew and slewing systemDslewing system only
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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