單項選擇題

ZYJ4電液轉(zhuǎn)轍機當溢流閥壓力為3.5MPa時,手搖電機,油泵壓力應(yīng)不大于().

A.3.3MPa±0.5MPa
B.4MPa±0.5MPa
C.5MPa±0.5MPa
D.6MPa±0.5MPa

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