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H2CO3
B:CH3COOH
C:HCOOH
D:HOOC-CH2-CH₂-COOH
KHC8H4O4−HCl
B:NaH2PO4−Na2HPO4
C:NH4Cl−NH3⋅H2O
D:NaAc−HAc
-NH2
B:-COOH
C:-CH3
D:-SO3H
E:-CH2CH2CH3
AI3+
B:AIO2-
C:CO32-
D:H2PO4-
(∂V/∂nB)T,p,nC(C≠B)
B:(∂H/∂nB)S,p,nC(C≠B)
C:(∂G/∂nB)p,V,nC(C≠B)
D:(∂S/∂nB)T,H,nC(C≠B)
CHCl3
B:CH2Cl2
C:CH3Cl
D:CCl4
is any chemical reaction in which atoms of the elements or their ions accept electrons
B:is associated with the decrease of the positive oxidation number of atoms
C:of silver by hydrogen is proceeding according to the reaction Ag2S+ H2→2Ag + H2S
D:it is also the combination of compounds with hydrogen
E:of organic compounds proceeds usually as the hydrogenationFeCl3
B:Ag(NH3)2]+
C:KMnO4
D:AlCl3
is caused mainly by calcium sulfate and magnesium sulfate
B:is caused mainly by CaSO4 and MgSO4
C:cannot be removed by boiling
D:can be removed by the addition of Na2CO3 while CaCO3 and MgCO3 are produced
Hg(CH3)2
B:HgO
C:Hg
D:Hg2Cl2
CH3CH2Cl
B:CH3CH2Br
C:CH3CH2I
PaO2↓
B:PaCO2↓
C:PaCO2正常
D:PaO2正常
1.96μ
B:1.96
C:2.58
D:t 0.05/2,v S
E:t 0.05/2,v S(x拔)
H2S
B:CO2
C:CO
CaF2
B:FeO
C:SiO2
D:P2O5
KMnO4
B:HCl
C:Cl2
D:NaOH
Fe(OH)3
B:FeS
C:Fe₃O₄
D:Fe₂O₃
E:Fe(OH)2
维生素B2
D:维生素B12
E:维生素B6
Q1+Q2/4πE0r
B:Q1/4πE0R1 + Q2/4πE0R2
C:0
D:Q1/4πE0R1