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自卸汽车和电动轮自卸汽车的基本区别是什么？

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（）那天，白娘子在丈夫的勉强下喝了一口雄黄酒。

A. 清明节
B. 端午节
C. 中秋节

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普通平键连接的主要用途是使轴与其上的零件（）。

A. 沿轴向固定并传递轴向力
B. 沿周向固定并传递转矩
C. 安装与拆卸方便

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A developer is creating a class Book， that needs to access class Paper. The Paper class is deployed in a JAR named myLib.jar. Which three， taken independently， will allow the developer to use the Paper class while compiling the Bookclass？（）

A. The JAR file is located at $JAVA_HOME/jre/classes/myLib.jar.
B. The JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar..
C. The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.class.
D. The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar.
E. The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac - cp /foo/myLib.jar/Paper Book.java.
F. The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac - classpath /foo/myLib.jar Book.java

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中软主系统电源单元为系统提供（），具有（）（）及（）功能。

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