Giventwocollectionobjectsreferencedbycol1andcol2，whichofthesestatementsaretrue？（）
A. Theoperationcol1.retainAll（col2）willnotmodifythecol1object.
B. Theoperationcol1.removeAll（col2）willnotmodifythecol2object.
C. Theoperationcol1.addAll（col2）willreturnanewcollectionobject，containingelementsfrombothcol1 andcol2.
D. Theoperationcol1.containsAll（Col2）willnotmodifythecol1object.
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Whichstatementsconcerningtheeffectofthestatementgfx.drawRect（5，5，10，10）aretrue，giventhatgfxisareferencetoavalidGraphicsobject？（）
A. Therectangledrawnwillhaveatotalwidthof5pixels.
B. Therectangledrawnwillhaveatotalheightof6pixels.
C. Therectangledrawnwillhaveatotalwidthof10pixels.
D. Therectangledrawnwillhaveatotalheightof11pixels.
各级公务员要从（)的高度，坚持学习，把学习贯穿于自己的整个生命旅途，努力成为终身学习的楷模。
A. 对党的事业和人民的利益负责
B. 从巩固党的执政之基和提高党的执政能力和水平
C. 从不断提高自身修养
D. 从提高政治文明
Whichstatementsconcerningthevalueofamembervariablearetrue，whennoexplicitassignmentshavebeenmade？（）
A. Thevalueofanintisundetermined.
B. Thevalueofallnumerictypesiszero.
C. Thecompilermayissueanerrorifthevariableisusedbeforeitisinitialized.
D. ThevalueofaStringvariableis""（emptystring）.
E. Thevalueofallobjectvariablesisnull.
Giventhefollowingcodefragment：publicvoidcreate（）{VectormyVect；myVect=newVector（）；}Whichofthefollowingstatementsaretrue？（）
A. Thedeclarationonline2doesnotallocatememoryspaceforthevariablemyVect.
B. Thedeclarationonline2allocatesmemoryspaceforareferencetoaVectorobject.
C. Thestatementonline2createsanobjectofclassVector.
D. Thestatementonline3createsanobjectofclassVector.
E. Thestatementonline3allocatesmemoryspaceforanobjectofclassVector.
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