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GBT 5475-1985 离子交换树脂取样方法.pdf
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GB/T 1 5268 一1 9 94自ij言 为了适应制丝业技术进步的需要,本标准通过采用先进的茧检定自动缴丝机等设备,使桑蚕鲜茧检验达到快速...
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GBT 5566-1985 胶管耐压扁试验方法.pdf
GBT 5567-1994 橡胶、塑料软管及软管组合件 真空性能的测定.pdf

