采煤工作面风量突然变小,做为班组长应该()
A、保证采煤机正常截割速度
B、降低采煤机截割速度
C、停止采煤
参考答案:C
16.In no place of China_______little about the economic development nowadays.
A.the local government cares
B.does the local government care
C.doesn't the local government care
D.cares the local government
后牙为远中错,前牙深覆盖,其矫治原则为()
A.矫治前牙反
B.减径或减数
C.矫正颌间关系,推上牙弓往后,或牵下牙弓向前,或两者并用
D.缩小牙弓或结合修复治疗
E.以上都不是