单项选择题
A.3%~5%B.1%~3%C.2%~5%D.3%~6%
A.外墙B.内墙C.承重墙D.隔墙
A.30~70mmB.100~140mmC.200~300mmD.50~70mm
A.30~70mmB.10~40mmC.20~40mmD.10~30mm
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