int.(表示驚訝、厭煩等)哎喲
The influence of adding the HS powder and PVA sol together or respectivly on the original and retained strewth, bench life and moisture resistance of the CO_2 sodium silicate sand was studied. 研究了HS粉與PVA單獨及復(fù)合使用后對水玻璃砂初始強(qiáng)度、殘留強(qiáng)度,可使用時間以及抗吸濕性的影響。
