单选题Production of mechanical foam by a portable in-line foam proportioner（）.Aincreases the size of foam bubbles formedBincreases the rate of foam productionCimproves the extinguishing properties of foamDgives the nozzleman more freedom of movement，since it can be placed anywhere in the hose line
单选题
Production of mechanical foam by a portable in-line foam proportioner（）.
A
increases the size of foam bubbles formed
B
increases the rate of foam production
C
improves the extinguishing properties of foam
D
gives the nozzleman more freedom of movement，since it can be placed anywhere in the hose line
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