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问题
判断题
污水立管上部的伸顶通气管径一般与污水管径相同。
答案
参考答案：
对
选择题
_____ his homework in time, he had to stay up late into the night.
A. Finishing
B. Having finished
C. To finish
D. To have finished
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选择题
下列哪一行为是健康的生活方式[ ]
A．常吃生冷食物
B．因烦恼而喝酒
C．和朋友分享快乐
D．不吃早餐
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