Large volumes of carbon dioxide are safe and effective for fighting fires in enclosed space, such as in the pumproom, provided that the（）.<br>A:persons in the space wear gas masks<br>B:persons in the space wear damp cloths over their mouths and nostrils<br>C:ventilation system is secured and all persons leave the space<br>D:ventilation system is kept operating

Large volumes of carbon dioxide are safe and effective for fighting fires in enclosed space, such as in the pumproom, provided that the（）.
A:persons in the space wear gas masks
B:persons in the space wear damp cloths over their mouths and nostrils
C:ventilation system is secured and all persons leave the space
D:ventilation system is kept operating

出自：海船船员证

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