主要运输巷道的净高，自( )面起不得低于2米。
A
暂无解析
防止颅内出血加重的护理措施不妥的是（）
Itisdifficultto________theimplicationbetweenthelines.
In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.
Thenewdiscovery_______beofgreatservicetomankind.
Whenyou're_____acrisis,itoftenhelpstotalktosomeone.
