将物体受到两个共点力和合成为一个力,下列说法正确的是( )
BC
The football fans went on watching the match it was rainy. [ ]
A. although
B. but
C. if
D. so
( )是人民警察的象征与标志。
A.警歌
B.警纪
C.警徽
D.警服