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搜题
【单选题】
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】下列滴定中,不能准确滴定的是()
A.
0.10mol/LHCl滴定0.10mol/LNH3•H2O(KB=1.75×10-5)
B.
0.10mol/LNAOH滴定0.10mol/LNH4Cl
C.
0.10mol/LHCl滴定0.10mol/LNACN(KA=4.9×10-10)
D.
0.10mol/LNAOH滴定0.10mol/LHCOOH(KA=1.7×10-4)
【判断题】艾滋病全称为获得性免疫综合症(AIDS),会导致免疫力低下,从而十分容易感染其他疾病。( )
A.
正确
B.
错误
【单选题】下列滴定中,不能准确滴定的是( )
A.
0.10mol/LHCl 滴定 0.10mol/LNH3·H2O ( Kb=1.75×10 )
B.
0.10mol/LNaOH 滴定 0.10mol/LNH4Cl
C.
0.10mol/LHCl 滴定 0.10mol/LNaCN ( Ka=4.9×10 )
D.
0.10mol/LNaOH 滴定 0.10mol/LHCOOH ( Ka=1.7×10 )
【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?
A.
to answer
B.
to begin
C.
to get out of sight
【多选题】财产保全的方式包括( )。
A.
诉前财产保全
B.
诉中财产保全
C.
诉后财产保全
D.
执行财产保全
E.
以上都对
【单选题】下列酸碱中,不能被准确滴定的物质是
A.
NH2OH. HC1[ Kb(NH2OH) = 9.1×10-9 ]
B.
NH4Cl[Kb(NH3) = 1.8×10-5]
C.
(CH2)6N4H+[Kb((CH2)6N4)=1.4×10-9]
D.
HAc(cKa = 1.8×10-5)
【单选题】_____ carelessly, the boy made mistakes here and there.                .
A.
being written
B.
Wrote
C.
Write
D.
Writing
【单选题】According to Haley, there is a difference between “being a writer” and writing and the latter means
A.
a dream you cherish
B.
spending hours at the typewriter writing
C.
expecting the fame and wealth of a writer
D.
mistaking “writing” for wealth and fame
【单选题】根据24节气判断以下有关上饶的描述正确的是 ( )
A.
寒露的夜较清明的昼短
B.
小寒较大寒日出时刻早
C.
立春与立冬的正午太阳高度相同
D.
夏半年与冬半年时间长度一样
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