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1.A variable defined within a scope is available only to the end of that scope.
作为在作用域里定义的一个变量，它只有在那个作用域结束之前才可使用。收藏指正
2.Thus the C and C++ ability to “hide” a variable in a larger scope is not allowed because the Java designers thought that it led to confusing programs.
所以C和C++能将一个变量“隐藏”在一个更大的作用域里。但这种做法在Java里是不允许的，因为Java的设计者认为这样做使程序产生了混淆。收藏指正
3.This paper shows three sufficient conditions which are used by the first order derivative to justify the existence of extremevalue of the two variable function, observing that the result by this paper is wilder applying scope than those correspondingtheorem in general integral-differential textbooks.
本文给出了用一阶导数判定二元函数极值存在的三个充分条件,并阐明了本文给出的结论比微积分学教科书中的相关定理具有更广的应用范围.收藏指正
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