截齿
参考答案：截齿是安装于螺旋滚筒上的用来直接破碎煤的刀具。
首选的紧急处理是
A．立即吸氧
B．迅速建立静脉输液通路
C．气管切开
D．无痛下清创
E．及时使用抗生素
Progress so far has been very good. ______, we are sure that the project will be completed on time.
A．However
B．Otherwise
C．Therefore
D．Besides
