单项选择题
A.踏步板 B.梯段斜梁 C.梯段板 D.板凳柱
A.100mmB.110mmC.120mmD.130mm
A.400~500mm B.500~600mm C.600~700mm D.700~800mm
A.900mm B.1000mm C.1100mm D.1200mm
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