what system contracts when breathing in?

2015-11-15 4:55 am
更新1:

what breathing system contracts when breathing in

回答 (1)

2015-11-20 8:04 am
✔ 最佳答案
A breathing system for divers includes a breathing bag from which the inhalation gas to the diver is delivered and to which the exhalation gas from the diver is supplied, a compressed gas source for the supply of breathing gas。


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