Paul,__________ ?-Oh, that’s my father! And beside him, my mother.

单选题

Paul,__________ ?-Oh, that’s my father! And beside him, my mother.

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判断题

官能团-OH称为羰基。

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单选题

havetohavemywatchmended，__42__lateagaintomorrow，”shesaid.“It’smyfirstday__43__withanewfirmtodayandtheytoldmethattheman__44__isverystrict.I__45__himyetsoIdon‘tknow__46__buthesoundsabitfrightening.”Shetalkedabouthernewjob__47__thewaytoLondonandbeforelong，Irealizedthatshewasgoingtoworkformyfirm.My__48__secretaryhadjustleftsoImustbehernewboss.__49__onlyfairtotellher.“Oh，dear，”shesaid.“__50__mistake!IwishIhadknown.”“Nevermind，”Isaid.“Atleastyou‘llknowwhenyourtrain’slatethatminewillbe，too.”__________

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填空题

各选一种化学药品鉴别下列各组物质，并指出鉴别依据及反应的化学方程式．（1）BaS04和BaCO3：试剂为__________，依据为____________________，离子方程式为______________________________．（2）Al（OH）3和Mg（OH）2：试剂为__________，依据为____________________，离子方程式为______________________________．（3）NH4C1和（NH4）2S04：试剂为__________，依据为____________________，离子方程式为______________________________．（4）Na2C03和NaHC03:试剂为__________，依据为____________________，离子方程式为______________________________．

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