單項選擇題

4g硫酸汞最高可絡合（）mg氯離子（硫酸汞分子量為296.65，氯分子量為70.91）。

A.30
B.35
C.40
D.45

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多項選擇題

WhydoesthedatacommunicationindustryusethelayeredOSIreferencemodel？（Choosetwo.)（）

A.Itdividesthenetworkcommunicationprocessintosmallerandsimplercomponents，thusaidingcomponentdevelopment，design，andtroubleshooting.
B.Itenablesequipmentfromdifferentvendorstousethesameelectroniccomponents，thussavingresearchanddevelopmentfunds.
C.Itsupportstheevolutionofmultiplecompetingstandards，andthusprovidesbusinessopportunitiesforequipmentmanufacturers.
D.Itencouragesindustrystandardizationbydefiningwhatfunctionsoccurateachlayerofthemodel.
E.Itprovidesameansbywhichchangesinfunctionalityinonelayerrequirechangesinotherlayers.