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【单选题】
的密度为（）g/cm 3 。
A.
2.15
B.
2.65
C.
3.15
D.
3.65
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【简答题】当进入VB.NET集成环境,发现没有显示“工具箱”窗口,应选择 菜单的 选项,使“工具箱”窗口显示,并最好将其窗口的属性设置为 。
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