单选题

Pressure in an operating hydraulic system is developed ______ (237416:第2 章船舶辅助机械:747)

A only by the pump as its primary function

B by resistance to the fluid flow through the system

C by the thermal input to the system’s fluid

D solely by the charge applied by the accumulators

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正确答案：A （备注：此答案有误）

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