皮皮学，免费搜题
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【多选题】
提取法测定脂肪适用于A.
脂类含量较高的样品
B.
结合态的脂类含量较少的样品
C.
能烘干磨细的样品
D.
适合测定鱼类、贝类、蛋品等含磷脂较多的样品
E.
不易吸湿结块的样品
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A.
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【单选题】PubLic transit. In North America, public transportation has been the major casualty of the commitment to the automobile. Ridership on public transportation declined in the United States from 23 billio...
A.
In the U. S. , commuter railroad service, trolleys and buses have been reduced.
B.
Subways have largely been maintained.
C.
Fares usually could not cover operating costs.
D.
U.S. public officials think it worthwhile to subsidize public transportation.
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