A:234
B:2.34×108
C:2.34×109
D:23.4
生物与非生物的最根本区别是
时间/s
0
1
2
3
4
5
n(NO)/mol
0.020
0.010
0.008
0.007
- Can you go swimming with us this afternoon?
- I'd love to, but I ____________ take care of my mother because she is ill.