随着汽车工业的发展和轿车进入千家万户,汽车的行驶安全已引起人们的广泛关注.汽车在弯道上转弯时若不注意控制好车速,很容易造成侧滑或侧翻而酿成交通事故.
时间/s
0
1
2
3
4
5
n(NO)/mol
0.020
0.010
0.008
0.007
--- You look unhappy. What happened?
--- I just had a fight with my mom and I felt __________ it. I shouldn’t have done that.
计算:(13)﹣1+(12)2×(﹣2)3﹣(π﹣3)0.