哪些药材可防止冬虫夏草生虫（）
A.泽泻
B.藏红花
C.大蒜
D.细辛
E.生姜
参考答案：B
17滚动轴承的径向游隙分几种？径向游隙过大过小有哪些害处？
–What did your mother say, Tom? -She asked me why _ __.
A．mysisterwas crying
B．mysisteriscrying
C．ismysistercrying
D．wasmysistercrying
