单选题In comparison to electric power，hydraulic power for jacking systems has the advantage of（）.Abetter control capabilitiesBless maintenance and repairCfewer personnel needed during jackingDless preload needed
单选题
In comparison to electric power，hydraulic power for jacking systems has the advantage of（）.
A
better control capabilities
B
less maintenance and repair
C
fewer personnel needed during jacking
D
less preload needed
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