下列关于更改组名说法正确的是（）。 ["更换组名时不会保持其所有属性","windows NT4.0提供了改变组名的方便机制","windows NT3.51以上的版本提供了改变组名的方便机制","更改组名也会保持其所有属性"]
若要多列显示列表项，可通过设置列表框对象的（）属性来实现。 ["Columns","MultiSelect","Style","List"]
The function of （） in a refrigeration plant using Freon is to move moisture from all refrigeration system. ["filter","filter drier","heat exchanger","air cooler"]
Which method is used to supply inert gas from a flue gas system to the cargo tanks?（） ["Exhaust gas pressure from the stack","High capacity fan","Inert gas compressor","Natural aspiratio"]
The boiling and condensation points of refrigerant mainly depend on the （） exerted upon it. ["temperature","density","volume","pressure"]
简述毛管虫病的病源。
