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【单选题】
单选 (2分) 一种自由构成的形式,不受骨格的限制,而是依据形态本身的大小、疏密、虚实、形状隐显色彩等方面的对比而构成的是( )。A.
发射构成
B.
对比构成
C.
重复构成
D.
密集构成
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【简答题】Many people like traveling for their holiday. They go to 1 , seaside or forests. Some people like 2 , so they like to visit some old interesting places. In many countries, the travel agency can he...
【简答题】数控机床按伺服系统的控制方式可分为（），（）和（）。
【单选题】The reason ________ many people like the film Not One Less is ________ most of the people in the
A.
20. The reason ________ many people like the film Not One Less is ________ most of the people in the film use their real names and play themselves. A．why; because
B.
for; that
C.
for; because
D.
why; that
【单选题】Many people like Xiao Shenyang because he often makes people _______ happily..
A.
laughing
B.
to laugh
C.
laugh
D.
laughs
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【单选题】At weekend many people living in the city like to go tothe village, _______ there are a lot of green plants and fresh air.
A.
around which
B.
aroundthat
C.
aroundwhere
D.
around what
【单选题】属于三级污水处理工艺的是( )。
A.
在污水处理设施进口处，必须设置格栅，主要是采用物理处理法截留较大的漂浮物，以便减轻后续处理构筑物的负荷，使之能够正常运转
B.
将污水中呈溶解性、胶体状态的有机污染物转化为无害物质，从而达到排放的要求，一般去除率能达到90%以上
C.
有机污染物可达到排放标准，处理后的五日生化需氧量(BOD 5 )可降至20～30 mg
D.
处理难以降解的有机物、磷和氮等能够导致水体富营养化的可溶性无机物等
E.
生物脱氮除磷法、混凝沉淀法、砂滤法、活性炭吸附法、离子交换法和电渗析法等
【单选题】在微污染水源水处理中,有时在混凝工艺之前增加生物预处理工艺,主要作用是哪一项?
A.
发挥生物絮凝作用，提高混凝效果
B.
发挥生物氧化作用，去除水中氨氮、有机物等污染物
C.
发挥生物光合作用，增加水的溶解氧含量
D.
增加水的活性，防止后续工艺中水体变质
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