单项选择题
A.承重墙、实体墙 B.内墙、外墙 C.实体墙、空体墙、复合墙 D.承重墙、非承重墙
A.2%~3% B.3%~4% C.0.1%~0.3% D.0.5%~1%
A.900mm B.800mm C.1000mm D.1200mm
A.550 B.600 C.700 D.500
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