单选题In which of the listed hydraulic systems will the installation of an oil cooler be necessary?（）AConstant tension mooring winch systemBHatch cover systemCWatertight door systemDInternal combustion engine hydraulic starter system
单选题
In which of the listed hydraulic systems will the installation of an oil cooler be necessary?（）
A
Constant tension mooring winch system
B
Hatch cover system
C
Watertight door system
D
Internal combustion engine hydraulic starter system
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