Gets or sets the state of the bit flag indicated by the specified mask.
获取或设置由指定屏蔽指示的位标志的状态。
An indicator, usually a single binary bit, whose state is used to inform a later section of a program that a condition, identified with flag, had occurred.
通常由一个二进制位组成的指示符，它的状态用来通知一个程序的后面的某一部分，由指示符所标识的以及由它所指定的状态业已发生。
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