r1 is the hub , multipoint mode subinterface, r2 and r3 is spoke, when r2 down at the spoke, What will r1 react?how about r3?
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根据《建筑施工碗扣式钢管脚手架安全技术规范》,当搭设不少于两步三跨1.8m×1.8m×1.2m﹙步距×纵距×横距﹚的整体脚手架时,每一框架内横杆与立杆的垂直度偏差应小于()mm。
A. 2
B. 3
C. 5
D. 6
已知KMnO4的相对分子质量为158.03,其摩尔吸光系数ε=2.2×103,在545nm波长下,用浓度为0.02g/L的KMnO4溶液,以3.00cm比色皿测得的透过率应为多少?