仓库通风有（）等方式。
A.自然通风
B.机械自然通风
C.机械循环通风
D.制冷通风
E.人工通风
参考答案：A, B, C, D
– Excuse me, may I use your bicycle? ______ is broken.
-- Certainly. But remember to return it before lunch.
A．I
B．Me
C．Myself
D．Mine
简述基站充放电实验的步骤。
