After putting on a self-contained breathing apparatus，you open the air supply and hear a continuous ringing of a bell. What does this mean? （）
1、A self-contained breathing apparatus i
A self-contained breathing apparatus is used to（）.Amake underwater repairs to bargesBdetermine if the air in a tank is safe for menCenter areas that may contain dangerous fumes or lack oxygenDresuacitate an unconscious perso
2、The bypass valve on a self-contained b
The bypass valve on a self-contained breathing device should be opened if（）.Ayou are entering a space containing poisonous vaporsByou are enter...
3、After transferring a weight forward on
After transferring a weight forward on a vessel, the draft at the center of flotation will（）.Achange, depending on the location of the LCGBincreaseCdecreaseDremain constant
4、3． Please put on your sweater．lt-s ver
3． Please put on your sweater．lt-s very __________outside．A hotB coldC expensiveD small
5、The Chief Officer insisted on putting
The Chief Officer insisted on putting remarks regardless（）my objection.AatBinCofDwith
6、After performing a modification on the
After performing a modification on the /etc/ssh/sshd_config file the operator needs to reinitialize the secure shell daemon to enable the new se...