题目内容

若一元二次方程 x^2 +4x+c=0有两个不相等的实数根, 则c的值可以是(写出一个即可) .

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生化性能差的污水接种浓度为

When he was arrested, Terry_________in crime for years.

A. had involved
B. should be involved
C. must be involved
D. had been involved

分解因式: x^2﹣y^2﹣3x﹣3y=__________ .

正常运行的活性污泥系统中,污泥本身是黄褐色或()

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