变速器操纵杆下端弧形工作面和拨叉导块凹槽磨损过大，会导致（）。
A.变速器换挡困难
B.变速器跳挡
C.变速器异响
D.变速器漏油
参考答案：A
用所给词的适当形式填空。
1. — Where is Mr. Wang?
— He ______ (go) to the library. He wants to borrow some library books.
2. At first she ______ (think) about going camping, but later she changed her mind.
3. They are from ______ (foreigner) countries.
4. I ______ (discover) the truth, but I couldn't tell it to others.
5. How long have you been ______ (wait) here?
宜用中火炒炭的药物是（）
A.蒲黄
B.山楂
C.地榆
D.干姜
E.栀子
