子弹按其弹头用途可分为普通弹和（）。
A.战斗弹
B.空包弹
C.教练弹
D.特种弹头
参考答案：D
If you are not familiar ____ the topic, you may write something that is familiar ____ you. [ ]
A. with; with
B. to; to
C. to; with
D. with; to
表证与里证最主要的鉴别点是()
A.寒热是否并见
B.是否有汗
C.舌苔是黄是白
D.是否头身疼痛
E.是否咳嗽有痰
