A.1/3 B.1/2 C.2/3 D.1/4
A.防酸背涂 B.防腐背涂 C.防堿背涂 D.防裂背襯
A.它們有美麗的木紋 B.表觀(guān)密度比針葉樹(shù)大 C.濕脹干縮變形通常小于針葉樹(shù)的脹縮變形 D.材質(zhì)比針葉樹(shù)硬,稱(chēng)為硬木材