问题
单项选择题
采用聚合铝作混凝剂时，聚合铝的碱化度应该在（）。
A、30%以下；
B、50%~90%的范围内；
C、80%以上
答案
参考答案：B
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采用聚合铝作混凝剂时，聚合铝的碱化度应该在（）。
A、30%以下；
B、50%~90%的范围内；
C、80%以上
参考答案：B
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| Nick is a 14-year-old school boy. His life is full of exams and studies on weekday. He has 1 free time. He thinks playing computer games 2 the best way to make him relax. When he has free time, he sits in front of the computer. Just 3 that way, he doesn't eat or drink for several hours. Last weekend, he played games on the computer again. He was too 4 and didn't want to move. He didn't have 5 for six hours. When he had to go to the bathroom, he found he could not move. He 6 to the hospital. The doctor told him he should have a good rest and 7 exercise. After coming back from the hospital. Nick follows the doctor's 8 . He often plays soccer with his friends. 9 sometimes he still plays computer games on weekends, he 10 does it for long. Now he lives a happy and healthy life. | ||||
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