第19题: [单项选择]I know it isn't important but I can't help ______ about it. A. but to think B. thinking C. think D. to think 参考答案:B 答案解析:有些动词或动词短语如:acknowledge,admit,advise,allow,appreciate,avoid,cannot help, cease,complete,consider,cont
第22题: [单项选择]一污水处理厂每日处理污水量为5000m3,采用生物接触氧化技术处理,若处理1m3污水所需空气量为15m3,则生物接触氧化池每小时所需空气量为______m3/h。 A. 2800 B. 2896 C. 2928 D. 3125 参考答案:D 答案解析:生物接触氧化池每小时所需空气量D=D0Q=15×5000÷24=3125(m3/h)。