试分析空压机出现喘振的原因及处理方法。
参考答案：
—What do you plan to do on the ___________ May Day holiday?
—I have no idea. Probably, I will spend it by doing many papers.
A．three-day
B．three-days
C．three days
D．three day’s
郭沫若属于（）派诗人代表。
A、新月诗
B、自由诗
C、现代诗
D、象征诗
