哪些情况应启动橙色预案?
参考答案:任一风井停风;矿井一翼停产;采掘工作面瓦斯浓度达到1.5~3%;矿井采掘地点发生出水达到500~1000m3/h时。
You did not perform as well as the other competitors—________,you failed.
A.in other words
B.after all
C.in the end
D.at the same time
John and Lina are .[ ]
A. boys
B. student
C. boy
D. twelve years old