Production of mechanical foam by a portable in-line foam proportioner().
Foaming of the oil in a refrigeration compressor crankcase is caused by ().
Portable foam type fire extinguishers are most effective on().
Foam-type portable fire extinguishers are most useful in combating fires involving().
Foam-type portable fire extinguishers are more usefull in combating fires involving().
Excessive oil foaming in the crankcase of a refrigeration compressor can result in ().
Foam extinguishes a fire by().
In a refrigeration system, foaming of the crankcase oil may cause the ().
After using a C02 portable extinguisher,it should be().
A CO2 portable extinguisher is annually checked by().
When entering a foam injected space () breathing apparatus.
A portable foam fire extinguisher is placed in operation by()
A foam-type portable fire extinguisher would be most useful in combating a fire in().
How do you operate a portable C02 fire extinguisher?().
A C02 portable extinguisher is annually checked by().
Foam is a very effective smothering agent and().
Foam extinguishes a fire mainly by().
After using a C02 portable extinguisher,it should be().
A foam-type portable fire extinguisher is most useful in fighting a fire in().
A condition that can increase the foaming tendency of lube oil is ()
A portable foam (stored-pressure type) fire extinguisher would be most useful in combating a fire in().
portable computer的中文释义为()A、便携式电脑