I don't know he will win tomorrow. I never doubt it will rain tomorrow.
A:if, if
B:if, that
C:whether, whether
D:that, if
A
B
C
D
强电解质
Fe
NaCl
CaCO3
HNO3
弱电解质
CH3COOH
NH3
H3PO4
Fe(OH)3
非电解质
C12H22O11(蔗糖)
BaSO4
C2H5OH
H2O
①圆柱 ②圆锥 ③球 ④正方体 ⑤长方体(请填上正确的序号).