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ThomasEdisonwasprobablythegreatest________inAmericanhistory.Whenhefirstattendedschool,histeacherscomplainedthathewas"tooslow"andhardtohandle._______,Edison'smotherdecidedtotakehersonoutofschoolandteachhimathome.TheyoungEdisonwasfascinatedbyscience.Attheageof10hehadalready________hisfirstchemistrylaboratory.Edison'sinexhaustibleenergyandgenius(whichhereportedlydefinedasmorethan“1percentinspirationand99percentperspiration”)eventually_______morethan1,300inventionsinhislifetime.WhenThomasEdisoninventedthelightbulb,hetriedover2,000experimentsbeforehegotittowork.Ayoungreporteraskedhimhowitfelttofailsomanytimes.Hesaid,“Ineverfailedonce.Iinventedthelightbulb.Itjusthappenedtobea2,000-step_______.”

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鉴别下列有机物。共40分。1、乙酸、乙二酸 2、甲酸、乙酸 3、水杨酸和苯甲酸4、丙酮和丙酸

浆纱是在织造前把具有( )的物质施加于经纱的内部和表面的工序。

A. 粘着性
B. 活化性
C. 流动性
D. 改善性

浆纱的目的是( )。

A. 并轴
B. 清除纱疵
C. 均匀纱线张力
D. 提高经纱的可织造性

浆纱工序由( )和( )两部分组成。

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