Tests of restrained initial shrinkage properties with plain and polyacrylonitrile fiber reinforced concrete and mortar are introduced in this paper.

对聚丙烯腈纤维增强水泥砂浆和混凝土的早期阻裂性能进行了试验研究。

youdao

Since 1988, the comprehensive management and development on agriculture of Huang-Huai-Hai plain has got initial effects.

1988年以来，黄淮海地区农业综合治理开发已初见成效。

youdao

Since 1988, the comprehensive management and development on agriculture of Huang-Huai-Hai plain has got initial effects.

1988年以来，黄淮海地区农业综合治理开发已初见成效。

youdao