A:always always
B:never: never
C:always often
D:always; never
物质
A
Cl2
Al
NaOH(aq)
B
NH3
O2
H2SO3(aq)
C
SO2
(NH4)2SO3(aq)
Ca(OH)2
D
Cu
FeCl3(aq)
HNO3
①山岛竦峙:____
②幸甚至哉:____
③客路青山外:____
④海日生残夜:____