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单选题
3052. 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.
答案解析
正确答案：B
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