下列物品中不能反复使用的是()
A、信号反射镜
B、海锚
C、目视信号装置
D、刀具
参考答案:C
Bobbie is always sick and weak his brother Frank is a good football player, as strong as a horse.
A.when
B.as
C.while
D.though
作战理论是揭示作战与作战指导规律并指导作战实践的理论。