A:以很大的速度向西做匀速直线运动
B:向西做减速运动
C:向西做加速运动
D:向东做加速运动
关于下图说法不正确的是( )
-My parents our home for a few hours when I arrived. I didn't meet them.-You could call them if you wanted to know where they were.
将CO2通入含溶质0.8g NaOH的溶液中,将充分反应后的溶液减压蒸发,得到1.37g固体,则通入CO2的质量是( )
世界上没有十全十美的选择,每一个选择都会带来相应的后果与责任,因此,我们不应该( )