某人射击一次击中目标的概率为0.6,此人射击3次恰有两次击中目标的概率为( )
A:54125
B:36125
C:27125
D:1825
如图表示初中化学常见的四个实验操作,请根据图示回答问题.
We arrived at the station too early and had ___________ to go, so we sat there and chatted with each other.
A、B、C、D四个带电小球,将它们靠近时,A吸引B,B排斥C,C吸引D,已知D带正电,则A 带 ____电,B带 ____电,C带 ____电.