水田杂草大体分类：（）杂草、（）杂草、（）杂草。
完全燃烧具备什么条件才能实现？
Disinfector in the sewage biological treatment plant usually is （） ["chlorine water","ozone","hypo-calcium chloride","calcium oxide"]
Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）. ["spark plugs","glow plugs","heat of compression","a magneto"]
Before marine sewage treatment plant works （） should be filled with fresh water. ["deposition chamber","oxidation pool","disinfection chamber","all chamber"]
电气设备停、送电操作的顺序如何？
