单选题The main advantage of improved Simplex tailshaft seal are（）Athe good sealing performance and the simple structureBthe good sealing performance and the short life expectancyCthe good sealing performance but the short life expectancyDthe good sealing performance and the lower cost
单选题
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
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