Mrs. King put a coat the sleeping girl to keep her warm.
A:over
B:with
C:behind
D:beside
t/s
0
500
1 000
1 500
c(N2O5)mol/L
5.00
3.52
2.50
下列说法不正确的是( )
如图所示的电路,闭合开关S1和S2后,下列分析正确的是 ( )