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Number (0): Everything in this space must add up to 0. The answer is 4-0, placed vertically.,推荐阅读谷歌浏览器【最新下载地址】获取更多信息
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It means that a module fully manages its data, i.e. any data that the module owns and operates can be altered only by the module’s code itself. If there’s a need to manipulate the data from outside, it’s done only via the module’s public API. It guarantees that there are no unauthorized changes to the data that come from other modules (i.e. a distant, unrelated code, which is not tested together). Encapsulation is also used to maintain invariants.,更多细节参见下载安装 谷歌浏览器 开启极速安全的 上网之旅。
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