The main advantage of improved Simplex tailshaft seal are____.A.the good sealing performan

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

请帮忙给出正确答案和分析，谢谢！

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