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下列说法正确的是（ ）
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污泥沉降比是指曝气池混和液在静止沉降（ ）后沉淀污泥的体积分数
活性污泥法处理工艺主要由（ ）组成。
Manyfresh college graduates are complaining nowadays that in today’s 1______________ market they are priced less thanvegetables. At the same time, there is a shocking labor 2_________________in the manufacturing areas inEastern and Southern China. Actually, there is nothing to be3__________________changeis important for the country to balance its job market and solve the problem of4__________________employmentfor college graduates. Rising salaries reflect the real value of blue-collarjobs. It is necessary to further promote a 5 ________________ labor force. The quality of China’seconomy is not built on innovation alone, but also on the6______________of its labor.
商城属于（）。
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