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Transfer of hydraulic fluid between hydraulic system A and B is caused by improper operation of system controls or worn equipment.

AUncontrolled system or old equipment cause hydraulic fluid flow from hydraulic system A to B

BIf you fail to operate the system control properly or the equipment is damaged, the hydraulic fluid will be transferred between hydraulic system A and B

CFlow of hydraulic fluid between hydraulic system A and B result in accidental operation of system controls or damaged equipment.

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正确答案：A （备注：此答案有误）

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