PVA真空断路器合闸失败的主要原因有那些？

A.CH 3 CH=CHCH 3
B.CH 2 =CH-CH=CH 2
C.CH 2 =CH-Cl
D.CH 2 =CH-CHO
E.CH 3 CH 2 CH 2 CH 3

aditional dress at the fashion show yesterday evening Joe: I think it’s very graceful for Chinese girls to wear a dress like that.Bob: So do I. In fact, it looked traditional but stylish to me.Joe: Do you think people can wear that stuff and walk around the streets Bob: Yes, of course. Don’t forget it stands for our traditional culture.Joe: ___________________________________. It depends.A．I don’t think it is always proper to wear a cheongsam outsideB．I don’t think it is alright to wear a cheongsam outsideC．I don’t think it is fashion to wear a cheongsam outsideD．I don’t think we should popularize this kind of fashion style