3由于活性污泥具有巨大的表面积,可以吸附大量的有机物,因此吸附时间较长。
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抹灰层一般由( )三部分组成。
A. 垫层、基层、面层
B. 垫层、砂石料、基层
C. 砂石料、基层、面层
D. 基层、垫层、面层
( )是“新艺术运动”的发源地。
A. 法国
B. 意大利
C. 英国
D. 中国
An entity that seeks to earn a profit by providing a good or service is known as a(n)
A. industry.
B. corporation.
C. business.
D. service.
________ is the amount a business earns after deducting what it spends for salaries and other expenses.
A. Profit
B. Revenue
C. Interest
Dividends