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【单选题】
There is a great deal difference between the eager man who wants to read a book, and the tired man who wants a book to read.A.
There is a great deal difference / between the eager man who/ wants to read a book, /and the tired man who /wants a book to read.
B.
There is a great deal difference between/ the eager man who wants to read a book, / and the tired man who wants a book to read.
C.
There is a great deal difference / between the eager man / who wants to read a book, / and the tired man / who wants a book to read.
D.
There is /a great deal difference between /the eager man who wants to read a book, /and the tired man who wants a book to read.
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【简答题】见书本P6的案例题所述,思考:向老年黑人脱帽致礼说明了什么?
【简答题】已知：Kspθ(Ag2 CrO4)=1．1×10-12，Kspθ(PbCrO4)=2．8×10-13，Kspθ(PbI2)=7．1×10-9，Kspθ(CaCrO4)=7．1×10-4，若向Ag+，Pb2+，Ca2+的浓度均为0．1 mol.dm-3的混合溶液中滴加K2CrO4溶液，则出现沉淀的顺序为________________；若将PbCrO4沉淀转化为PbI2沉淀，转化方程式为______...
【单选题】马斯洛的需要层次理论后来由五个层次发展到了七个层次。尊重需要以下层次的需要又被统称为( ),以上层次的需要被统称为( )。
A.
缺失需要，生长需要
B.
低层需要，高层需要
C.
生理需要，心理需要
D.
体力需要，脑力需要
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