对接溜槽前,应先将刮板底链铺开,尾部一头串过机尾部链轮不少于(),要注意刮板反正方向要正确。
A.1m
B.2m
C.3m
D.4m
参考答案:B
There are about seven ____ students in Grade Eight in Chezhan Middle School.
A.hundred B hundreds C hundred of D hundreds of
军交正规化建设应坚持的原则是什么?