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  • ZeroProduct 日期:2011-09-20 10:13:00 来源:作文地带 好评:优秀英语作文

    作文地带导读:When the product of any number of terms is zero, you know that at least one of the terms is equal to zero. For example, if xy = 0, you know that either:x = 0, and y ≠ 0 y = 0, and x ≠ 0 x = y = 0.  This is useful in a situ...

    either equation Product Zero equal

  • both, either, neither, all, any, none 日期:2010-08-09 01:01:30 来源:作文地带 好评:优秀英语作文

    both, either, neither, all, any, none 这些词都可用作代词或形容词。其位置都在be 动词之后,行为动词之前或第一个助动词之后。 1) both (两者都),either(两者中任何一个),neither (两者都不)。以上词使用范围为两个人或物。例如: Neither of the two boys is clever. 两个男孩都不聪明。...

    all 英语语法 代词 both neither none any either

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