题目内容

简述急性毒性试验的定义、目的及如何进行试验观察。

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YouworkastheapplicationdeveloperatCert-Tech.com.Cert-Tech.comusesVisualStudio.Net2005asitsapplicationdevelopmentplatform.YouuseaWindowsXPProfessionalclientcomputernamedClient01asyourdevelopmentcomputer.
Youaredevelopinga.NetFramework2.0applicationonClient01.Youwritethecodeshownbelow:PublicClassShape
PrivateshapeNameasString
PublicSubShape(ByValshapeNameasString)Me.shapename=shapeNameEndSub
PublicOverridableFuctionGetName()AsStringReturnshapeNameEndFunction
PrivateSubDrawShape()’AdditionalcodegoeshereEndSubEndClass
YoulaterdecidetohavetheapplicationcompiledandregisteredforCOMinteroperability.TheotherdevelopersonyourteamcomplaingthattheyareunabletocreateaninstanceoftheShapeclassintheirCOMapplications.YouarerequiredtoensurethatCOMapplicationsareabletocreateaninstanceoftheShapeclass.Whatshouldyoudo?()

The museum () built two years ago.

A. has been
B. was
C. is being

Let' s go and do the barbecue () ?

A. will you
B. shan t we
C. shall we

You () to practise English more .

A. ought
B. should
C. must

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