A.7d B.14d C.21d D.28d
A.濕潤紗布覆蓋 B.聚乙烯薄膜覆蓋 C.保水養(yǎng)護膜覆蓋 D.濕潤細砂覆蓋
A.≥0.30MPa B.≥0.50MPa C.≥0.70MPa D.≥0.90MPa