Which system(s) in the hydraulic systems of crane always hold(s) single side of load?（）<br>A:hoisting system only<br>B:hoisting system and luffing system<br>C:hoisting system and slew and slewing system<br>D:slewing system only

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

出自：海船船员证

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