气门弹簧借其弹力使气门及时关闭，并保证气门与气门座紧密配合。
查看答案
气门间隙过大，会使得的发动机所输出的扭矩降低，同时有异响产生。（ ）
A. 对
B. 错
1. _____ that they found a new way to deliver the cargo.
A. It was said
B. They are said
C. It said
D. It says
2. Beijing has taken on a new look before the Olympic Games. It isn't like_____ it used to be.
A. how
B. what
C. that
D. which
3. ____ is no possibility____ Tom will win the first prize in the swimming match.
A. There; that
B. It; that
C. There; whether
D. It; whether
微信支付 
支付宝支付