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单选题
57. Air pressure from the reservoir pressurization system maintains head pressure on hydraulic system A,B and the standby hydraulic system reservoirs
A
Air pressure from the reservoir pressurization system is obtained from the head pressure on hydraulic system A,B and the auxiliary hydraulic system reservoirs.
B
Air pressure from the reservoir pressurization system keeps head pressure on hydraulic system A,B and the auxiliary hydraulic system reservoirs.
C
Air pressure from the reservoir pressurization system adjusts the head pressure on hydraulic system A,B and the alternative hydraulic system reservoirs.
答案解析
正确答案：B
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