P A E R H K G C N M
____
— Of course.
a
b
c
d
①
Si
SiO2
H2SiO3
Na2SiO3
②
N2
NO
NO2
HNO3
③
Cu
CuO
Cu(OH)2
CuSO4
④
Na
NaOH
Na2CO3
NaHCO3
-- Ross, can I use your computer to do my homework?
-- Sorry, I don't have _______.