方头长圆柱端紧定螺钉 gb/t 85-88 添加 十字槽半沉头螺钉 gb/t 820-2000 添加 开槽圆柱端定位螺钉 gb/t 829-88 添加 开槽大圆柱头螺钉 gb/t 833-88 添加 六角头不脱出螺钉 gb/t 838-88 添加。开槽盘头螺钉 gb/t 67-2000 添加 开槽沉头螺钉 gb/t 68-2000 添加 开槽半沉头螺钉 gb/t 69-2000 添加 开槽锥端紧定螺钉 gb/t 71-85 添加。3047-1993 石油化工企业职业安全卫生设计规范1 gb/t1415-1992 米制锥螺纹2 gb/t7306.1~.2-2000 用螺纹密封的管螺纹3 gb/t7307-2001 非螺纹密封的管螺纹4 gb/t12716-2002 60o密封管螺纹5 gb/t985-1988 气焊。
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nr nsk 30*72*16 b30-93 nsk 30*72*19 nsk 6306ddu tm3/32 nsk 32*75*20 nsk 63/32nr b30-126n nsk 30*75*20 b30-120n nsk 30*80*21 b32-10 nsk 32*72*19 6306bllu/32 尼桑巴宁后轮 6306bllu/32 ntn 32*72*19 nsk b32-10 b32-14nr nsk 32*80*20 b32-18n nsk 32*80*23 外圈带n 32tm03 nsk 32*80*23 外圈带n带双胶盖 35dsf01 nsk 35*72*25 ntn sc07a32l u11/12/阳光/过桥 sc07a32l ntn 35*72*25 nsk 35dsf01 35tag802 nsk 35*65*28。in the meantime, a mixture of 79 g. (0.55 mole) of cuprous bromide (note 3) and 80 ml. (0.6 mole) of 48% hydrobromic acid is heated to boiling in a 5-l. round-bottomed three-necked flask, equipped with a condenser set for distillation and provided with a 2-l. receiving flask, a steam inlet tube closed by a screw clamp, and a separatory funnel. about one-fourth of the diazonium solution is transferred to the separatory funnel, without filtration, and immediately run into the cuprous bromide-hydrobromic acid solution, which is kept boiling over a free flame, at such a 药明康德内部保密资料 page 5 of 13。
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