_____ is NOT pollution prevention equipment. A: Oily water separator B: Sewage treatment plant C: Fuel oil separator D: Incinerator

After having switched off the mains separator, wait for ___________ before switching it back on.

中国大学MOOC: 重力式分离器gravitational separator工作原理operating principle：（）

Impurities in the fuel oil will affect the operation of the engine， which has （） the use of separator and some other devices.

Here some oil in the oily water separator， as a result of its lower （）， will separate and rise into the oil collection space.

以下不属于元素中使用的属性的是() A: separator B: collection C: current D: item

Which of the following equipment is not a traditional anti pollution equipment?_____ A: Ballast water treatment unit B: Exhaust gas boiler C: Oily water separator D: Incinerator

在编辑某菜单项时,要指明该菜单项是一个弹出式菜单,必须选择属性()。 A: Separator B: Pop-up C: Inactive D: Grayed

在使用MySQL的动态SQL功能时，下列选项中，不是循环标签＜foreach＞属性的是（ ） A: collection B: current C: separator D: item

After having switched off the mains separator, wait for ___________ before switching it back on. A: one minute B: at least one minute C: more than one minute D: no more than one minute