A:2.0V 0.8 W
B:2.5V 1.0W
C:4.5V 1.0 W
D:4.5V 1.8W
t / s
0
50
150
250
350
n(PCl3) / mol
0. 56
0. 75
0. 80
回答下列问题:
Lily wants ____ (join) the art club.