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ρmax≤1.2fa
B:ρk≤fa和ρmax≤1.2fa
C:ρk≤fa或ρkmax≤1.2fa
D:ρk≤1.2fa或ρmax≤fa
△P0
B:△PK
C:UK%
D:I0%
A>B>C
B、A<B<C
C、A<C<B
D、A>C>B
Q1+Q2/4πE0r
B:Q1/4πE0R1 + Q2/4πE0R2
C:0
D:Q1/4πE0R1
PII,PIII,PavF有切迹
B:P波的时时限<0.11秒
C:V1Ptf为.0.04mm/s
D:PII,PIII,PavF>0.25mv
E:P波形态园钝
KHC8H4O4−HCl
B:NaH2PO4−Na2HPO4
C:NH4Cl−NH3⋅H2O
D:NaAc−HAc
rB=dnA/Vdt
B:rB=dnB/Vdt
C:rB=dCA/dt
D:rB=dCB/dt
CHCl3
B:CH2Cl2
C:CH3Cl
D:CCl4
CH3CH2Cl
B:CH3CH2Br
C:CH3CH2I
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