电雷管与火雷管的根本*区别在于增加了()
A.电力点火装置
B.缓燃剂
C.加强帽
参考答案:A
It’s the third time ________ late for school this week.
A.that you are
B.you are
C.when you arrived
D.that you have been
腹腔干的三条分支,分别是————————————、—————————————与—————————————。