不好的方法：有时候模式中会指示数据项为可选，但系统中其他的部分却可能因为这部分数据的缺失而失败。
Bad: Sometimes a schema indicates that a data item is optional when some other part of the system downstream fails without the data. Here is an optional element in XML schema.
绝缘电阻表以前是按标度尺弧长定义的弧长误差，现行国家标准规定以指示值的百分数表示。
Formerly the arc length error for the insulation resistance instrument is defined by scale arc length. At present national standard determines that the percentage of indicated value expresses it.
访问的纠正行动选项卡以查看评估分数。2，一个消息框，提示您输入分数后，才读得分的指示，可于年底每一个问题。
Access the Corrective Actions Tab to view Assessment scores. 2, a message box prompts you to enter scores ONLY AFTER reading the scoring instructions available at the end of every question.
获取或设置一个值，该值指示是否在文档中包含的公式中使用小分数。
Gets or sets a value that indicates whether to use small fractions in equations contained within the document.
获取或设置一个值，该值指示是否在文档中包含的公式中使用小分数。
Gets or sets a value that indicates whether to use small fractions in equations contained within the document.
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