Not until all the fish died in the river ____how serious the pollution was. A. did the villagers realize B. the villagers realized C. the villagers did realize D. didn’t the villagers realize
A.
B.
C.
D.
D
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举一反三
【单选题】下列滴定中,不能准确滴定的是( )
A.
0.10mol/LHCl 滴定 0.10mol/LNH 3 · H 2 O ( K b =1.75 × 10 -5 )
B.
0.10mol/LNaOH 滴定 0.10mol/LNH 4 Cl
C.
0.10mol/LHCl 滴定 0.10mol/LNaCN ( K a =4.9 × 10 -10 )
D.
0.10mol/LNaOH 滴定 0.10mol/LHCOOH ( K a =1.7 × 10 -4 )
【单选题】Vanish (v.) means ______ —The magician made the rabbit vanish by slipping it under a secret door. —You gave a stranger $500 in cash to paint your house? How do you know he won’t vanish with the money?