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$NF B49-420-1970 Chemical analysis of refractories Silica materials Determination of silicon (rapid method by hydrofluoric volatilisation) 《耐火材料化学分析硅材料硅含量测定 (氢氟快速挥发法)》.pdf$ 2

$NF B49-420-1970 Chemical analysis of refractories Silica materials Determination of silicon (rapid method by hydrofluoric volatilisation) 《耐火材料化学分析硅材料硅含量测定 (氢氟快速挥发法)》.pdf$ NF B49-420-1970 Chemical analysis of refractories Silica materials Determination of silicon (rapid method by hydrofluoric volatilisation) 《耐火材料化学分析硅材料硅含量测定 (氢氟快速挥发法)》.pdf

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10

NF A82-130-1992 Spot welding Electrode back-ups and clamps 《点焊电极垫板和夹子》.pdf

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16

NF A82-111-1989 Electric resistance welding Low impedance cables Sizes specifications and tests 《电阻焊低阻抗电缆尺寸、规范试验》.pdf

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5

NF A82-108-1992 Dimensions of seam welding wheel blanks 《滚焊电极滚轮毛坯的尺寸》.pdf

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7

NF A82-103-1994 Straight resistance spot welding electrodes 《直电阻点焊电极》.pdf

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7

NF A82-102-1992 Electrode taper fits for spot welding equipment Dimensions 《点焊设备用电极锥形配合尺寸》.pdf

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8

NF A09-400-1991 Non destructive testing Infrared thermography Vocabulary concerning the designation of the equipment 《无损检验红外温度记录法有关设备名称的词汇》.pdf

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2

NF A09-355-1985 Non destructive testing Acoustic emission Coupling of piezoelectric sensors 《无损检验声音发射压电传感器的连接件》.pdf

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6

NF A09-352-1987 Non-destructive testing Acoustic emission Recommended practice for leak detection 《无损检验音发射泄漏检测推荐实施规程》.pdf

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11

NF A09-342-1991 Non destructive testing - Ultrasonic - Qualification of equipment settings《无损试验超声波设备设置的鉴定》.pdf

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