Staring from developing the bar code certificate with students' messages, the design conditions of the code order, the code length and the proofreader's mark etc.
从开发带有学生信息的条码证件这个应用角度出发，介绍了在研制开发学生证件过程中条码的码制、代码长度和校验符等设计条件的要求；
The quantity and the length of embedded splice bar shall meet the design requirements and the related construction code. And the spacing tolerance of splice bar is not bigger than a piece of brick.
预埋拉结筋的数量、长度均应符合设计要求和施工规范的规定，留置间距偏差不超过一皮砖。
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