The rated operating time of a self-contained breathing device may be reduced in actual use because of（）.<br>A:pressure differences in the atmosphere<br>B:the length of the hose attached to the facepiece<br>C:the physical exertion of the person wearing the device<br>D:spaces containing poisonous vapors

The rated operating time of a self-contained breathing device may be reduced in actual use because of（）.
A:pressure differences in the atmosphere
B:the length of the hose attached to the facepiece
C:the physical exertion of the person wearing the device
D:spaces containing poisonous vapors

出自：海船船员证

提示：
同一【IP】的非会员用户每天可免费获取10次答案

收藏本站【zk.995w.com】，下次访问不迷路

本站试题总数:【10252701】个 (题库试题定时更新)