题目内容
“What's your phone number” sounds a little too direct, especially when talking to members of the opposite sex.
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A simple variation to “What's your phone number” is “Could I get your number?”
Asking someone for his or her email address is also a little less direct than asking for phone number. The simple way to ask is “Could I get your email address?”
某工业废水的BOD5/COD=0.50，初步判断它的可生化性为（）
在好氧生物处理系统中的微生物主要是____,其它还有(藻类、原生动物和高等微型动物)。____是稳定有机废水的主要微生物,是好氧生物处理中最重要的。
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