单项选择题
A.防雨防潮 B.防寒防冬 C.防雨防寒 D.防止暴晒
A.50% B.70% C.90%
A.5~6M B.4~4.5M C.2.5~3.5M D.2M左右
A.2mm B.5mm C.10mm D.12mm
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