There is tea in the cup.
A:not
B:no
C:not a
D:no any
设a,b,c∈R则复数(a+bi)(c+di)为实数的充要条件是( )
英国宪章运动( )
温度/℃
0
10
20
30
40
50
60
70
80
溶解度/g
29.4
33.3
37.2
41.4
45.8
50.4
55.2
60.2
65.6