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【判断题】
公式 (┐P ∨ Q) ∧ (P→R) 与 (P→(Q ∧ R))等价
A.
正确
B.
错误
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举一反三
【单选题】—I don't like chicken ______meat, ______I like fish very much.
A.
and; and
B.
and; but
C.
or; but
D.
or; and
【单选题】为了除去混在 CO 2 中的 SO 2 和 O 2 ,下列试剂使用顺序正确的是 ( ) 1 饱和 Na 2 CO 3 溶 液 2 饱和 NaHCO 3 溶液 3 浓 H 2 SO 4 4 灼热铜网 5 生石灰
A.
①③④
B.
②③④
C.
②④③
D.
③④⑤
【单选题】汽水是CO 2 的饱和溶液,其中存在如下平衡: H 2 CO 3 H + +HCO 3 - ……①    HCO 3 - H + +CO 3 2 - ……② 将汽水倒入试管中分别进行下列实验,相应分析结论错误的是
A.
加热、平衡①、②可能都向左移动
B.
加入澄清石灰水,平衡①、②均向右移动
C.
加入CaCO 3 悬浊液,CaCO 3 的溶解平衡向正方向移动
D.
通入过量CO 2 或滴加氯水,溶液pH均减小
【单选题】蛋白质测定蒸馏过程中,接收瓶内的液体是( )。
A.
硼酸
B.
硝酸
C.
氢氧化钠
D.
磷酸
【简答题】Passage 2 Dear Linda, I have been in England three months now. I hope you don't think I've forgotten you. There have been so many places to see and so many things to do that I've not had much time for...
【单选题】某温度下,向一未饱和的Na 2 CO 3 溶液中加入20g无水Na 2 CO 3 或加入50gNa 2 CO 3 ?7H 2 O晶体,都恰好使溶液达到饱和,则Na 2 CO 3 在此温度时的溶解度为(  )
A.
25g
B.
75g
C.
50g
D.
10g
【简答题】英译汉:lubrication system
【简答题】在25℃,CO2气体压力等于1标准大气压时,CO2饱和水溶液中CO2的浓度约为0.034 mol.dm-3,计算溶液的pH和[CO32-]。通常把溶入的CO2都当成H2CO3,利用如下平衡式计算: H2CO3+H2O HCO3-+H3O+ Ka1=4.5×10-7
【单选题】听力原文:M: Would you like to go to see the movies with me this evening? W: I'd love to. But I’m just getting over the flu. What will the woman probably do this evening?
A.
Go to see the movies.
B.
Stay at home.
C.
Do some sports.
【单选题】I like comedies _______ I don't like documentaries at all; they're more than boring. [     ]
A.
and
B.
but
C.
or
D.
for
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