A:where
B:on which
C:on whe
D:that
如图,⊙O的半径是5,P是⊙O外一点,PO=8,∠OPA=30°,求AB和PB的长.
A
B
C
D
弱电解质
HCl
CH3COOH
HClO
Ca(OH)2
强电解质
H3PO4
FeCl3
BaSO4
HNO3
非电解质
CH4
Cu
C2H5OH
H2O
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