采用串联通风的掘进工作面,必须在被串工作面局部通风机前设置掘进工作面进风流甲烷传感器,其断电浓度为()%。
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On vessels over 100 gross tons,whose responsibility is it to ensure that all able seamen in the vessel’s crew have the documents and qualifications required by law and regulation?()
A. Master of the vessel
B. USCG Officer in Charge of Marine Inspection
C. Owner or operator of the vessel
D. Company's personnel director
“文件”菜单中的“退出”命令是( )。
A. 关闭Word2003窗口连同其中的文档窗E1,并退到WindowsXP窗V1中
B. 退出正在执行的文档,但仍在Word2003窗口中
C. 与双击窗口左上角的控制菜单图标功能相同
D. 与单击窗口左上角的图标,然后选择“关闭”命令相同