Simplex tailshaft seal equipment’s working condition is terribleThe main cause is （）<br>A:the shafting’s vertical vibration<br>B:violent friction and sea water corrosive<br>C:friction and high temperature<br>D:violent friction and high temperature

Simplex tailshaft seal equipment’s working condition is terribleThe main cause is （）
A:the shafting’s vertical vibration
B:violent friction and sea water corrosive
C:friction and high temperature
D:violent friction and high temperature

出自：海船船员证

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