起升机构减速机一般选用（）润滑。
A、干油
B、稀油
C、以上都不是
参考答案：B
Alport综合征的基因突变不包括（）
A.NPHSl
B.COL4A3
C.COL4A4
D.COL4A5
E.编码Ⅳ型胶原A链的基因突变
Yao Ming is one of the _____ on the Chinese basketball team. [ ]
A. most famous player
B. famous players
C. most famous players
D. famous player
