单选题

If the hydraulic pump does not give a pressure of 3000 psi, use the electric pump.

A If the hydraulic pump turns to generate pressure of 3000 psi, use the electric pump.

B If the hydraulic pump fails to generate pressure of 3000 psi, use the electric pump.

C If the hydraulic pump turns to supply pressure of 3000 psi, use the electric pump.

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正确答案：A （备注：此答案有误）

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