锅炉事故种类有（）、（）、（）、（）和（）。

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问题填空题

答案

参考答案：特别重大事故；特大事故；重大事故；严重事故；一般事故

单项选择题

Playing a major role in the economic life of the United States, ______.

A．women currently make up 46 percent of the work force

B．currently women make up 46 percent of the work force

C．the work force is currently made up of 46 percent women

D．46 percent of the work force is currently made up of women

问答题简答题

试分析园林植物在夏季对温度的调节作用。