The main advantage of improved Simplex tailshaft seal are()

A . the good sealing performance and the simple structure B . the good sealing performance and the short life expectancy C . the good sealing performance but the short life expectancy D . the good sealing performance and the lower cost

时间:2022-10-24 07:03:53 所属题库:船舶电气与船舶安全题库

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