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标准对数视力表
Standard for logarithmic visual acuity charts
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电视教室座位布置范围和照度卫生标准
Hygienic standard for seat arrangement and illumination in classroom with television
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书写板安全卫生要求
General provisions of safety and health for writing boards
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学生健康检查技术规范
Technical standard for physical examination for students
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中小学校教室采光和照明卫生标准
Hygienic standard for day lighting and artificial lighting for middle and elementary school
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铅笔涂层中可溶性元素最大限量
Maximum limits for soluble elements content of pencil coating
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