A number of biological sewage treatment plants are in use at sea but nearly all work on what is called the extended aeration processBasically the consists of oxygenating the liquor by bubbling air through itAccording to the above two sentences, the word "this" means （）. ["a sewage treatment plant","the extended aeration process","the liquor","the bubbling air"]
根据记忆保持时间长短分类，记忆可分为瞬间记忆、永久记忆、（）。 ["形象记忆和逻辑记忆忆","短时记忆和长时记忆","情绪记忆和运动记","无意记忆和有意记忆"]
下列哪种设备的安全监察不适用《特种设备安全监察条例》（） ["客运索道","铁路机车","大型游乐设施","起重机械"]
为什么配合饲料配方时需要考虑原料的消化利用率？
墙边开关安装高度可选择（）米。 ["0.15","1.3","1.4","1.5","1.8"]
强制阀本身可能发生哪些故障，如何处理？
