单项选择题
A.6MPa B.8MPa C.10MPa D.12MPa
A.油位太低或用错了液压油 B.吸油管不密封、进气 C.油直接回油箱未经冷却器 D.溢流阀不工作
A.1s B.2s C.3s D.4s
A.10s B.15s C.20s D.30s
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