“四位一体”安全防护措施有哪些？
参考答案：
独立的通风系统，反向风门，压风自救，远距离爆破。局部防逆风系统，隔离式自救器。
During the expedition in the mountains we passed through a place where in a little while we all lost out ______ of direction.
A．sense
B．feeling
C．idea
D．ability
整理归档文件要求做到（）。
A．保持文件之间的历史联系
B．确定文件保存价值
C．编制归档文件目录
D．加工编纂文件信息
ng the expedition in the mountains we passed through a place where in a little while we all lost out ______ of direction.