吹扫发电机用的压缩空气压力一般不要超过（）。
A.2MPa
B.20Mpa
C.0.2MPa
D.10MPa
参考答案：A
My father a cake and two eggs for his breakfast.[ ]
A. have
B. has
C. want
火药在我国用于军事，开始于 [ ]
A．隋末
B．唐初
C．盛唐
D．唐末
