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（8-1）如果要想使用jar包中类，则必须配置环境变量（）。

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（8-1）根据提示补全程序空白处，使程序能够正确运行。1.定义类Basepackagecn.edu.jsu;publicclassBase{①voidshow(){System.out.println("你好，中国！");}}2.定义测试类Demopackageper.cn.edu.jsu;importcn.edu.jsu.Base;publicclassDemo{publicstaticvoidmain(String[]args){Base.show();}}

Insufficien_____can cause a processor to work at 50% or even more below its performancepotential.

A. Mouse
B. I/O
C. document
D. memory

The usual address for a Web site is the page address, although you can enter _____________.

A. home
B. main
C. host
D. house

______:The phosphorescent surface on which an image is displayed, as on a television, computer monitor, or radar receiver.