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Q3161
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What is the range of angle for stair?
Q3162
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What is one end or both ends corners cut in plan of a step?
Q3163
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What is the combined framework of handrail and baluster in a stair?
Q3164
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What is an ordinary step of rectangular shape in plan?
Q3165
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Which type of stair with the steps are radiated from one point to upper floor?