单项选择题
A.现代B.金属C.明式D.实木
A.5~10 B.10~20 C.2~4 D.20~25
A.20 B.50 C.30 D.24
A.1.0%~3.0% B.1.5%~2.0% C.1.0%~2.0% D.2.0%~3.0%
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