There are some____on the desk.Let's draw some pictures with them.
设ξ的分布列如下:
ξ
﹣1
0
1
Pi
12
13
P
则P等于( )
选项
物质甲
物质乙
物质丙
A
HCl
Zn
AgCl
B
H2SO4
Fe2O3
NaOH
C
Ba(OH)2
NaCl
D
Na2CO3
CaCl2