第四章测试1.The biofilm in slow sand filtration has negative effect on water quality because it may increase the load of disinfection. （ ）
A:对 B:错
答案:B
2.The negative water head will not appear in ( ) process(es)?
A:Valveless filter B:Conventional rapid filter C:Siphon filter D:V-shaped filter 3.The expansion rate of single-layer quartz sand is usually about 40%-45%. ( )
A:对 B:错 4.The effective particle size of filter media refers to the particle size of filter media less than ( ) percent of the total weight after screening.
A:5 B:10 C:75 D:80 5.Supporting layer in the filter can also contribute to the uniform distribution of water to some extent. ( )
A:错 B:对
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