A.低溫 B.短期浸水 C.冷凍 D.長(zhǎng)期浸水
A.2%~3% B.1%~2% C.3% D.4%
A.普通混凝土空心磚 B.燒結(jié)多孔磚 C.燒結(jié)空心磚 D.蒸壓力氣混凝土砌塊