第4题: [单项选择]下列说法错误的是()。 A. 格栅的主要作用是去除会堵塞或卡住泵、阀及其他机械设备的大颗粒物等 B. 沉砂池一般设置在泵站和沉淀池之后,用以分离废水中密度较大的砂粒、灰渣等无机固体颗粒 C. 隔油池采用自然上浮法去除可浮油的设施 D. 事故池的主要作用就是容纳生成事故废水或可能严重影响污水处理厂运行的事故废水 参考答案:B 答案解析:B项错误,沉砂池一般设置在泵站和沉淀池之前,用以分离废水中密度较大的砂粒、灰渣等无机固体颗粒。
第16题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard{{/B}} A. People are expected to come at six. B. It will be a party for relaxation. C. A formal party will be held. D. There is no need to prepare special clothes. 参考答案:B 答案解析:[听力原文]
W: What time do you want people to come
M: Six. And tell them not to wear anything fancy.