A:examined
B:reviewed
C:tested
D:checked
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
如图为某生态系统的食物网示意图,请根据图回答:
89____100 80+8____90-2
____ ____ often ____ to the park at weekends?