单选题The bearing of tailshaft sealing equipment, which adopting the oil nature circulation is hot, the reason is（）Athe rotate speed fluctuationBthe ventilation tube cloggedCthe main engine accelerate so fastDstormy waves
单选题
The bearing of tailshaft sealing equipment, which adopting the oil nature circulation is hot, the reason is（）
A
the rotate speed fluctuation
B
the ventilation tube clogged
C
the main engine accelerate so fast
D
stormy waves
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