比较下列化合物用SephadexLH-20分离的R值:
(1)()>()>()>()>()>()
(2)()>()>()
(1)Rf值由大到小的次序:D>E>B>C>A>F。(2)Rf值由大到小的次序:A>C>B。
Goods are carried by several of transport--on road or rail, by sea or air.
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
2002年新配方口服补液盐(ORS)溶液的张力是
比较下列化合物用SephadexLH-20分离的R值:
(1)()>()>()>()>()>()
(2)()>()>()
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