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

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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