单选题Simplex tailshaft seal equipment’s working condition is terribleThe main cause is （）Athe shafting’s vertical vibrationBviolent friction and sea water corrosiveCfriction and high temperatureDviolent friction and high temperature
单选题
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
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