例句 /

The experimental study on harden time of silica sol shell molding with %NHCl and subnano-SiO has been done.

The experimental study on harden time of silica sol shell molding with %NHCl and subnano-SiO has been done.

对添加%NHCl和亚纳米SiO的硅溶胶壳型硬化时间进行实验研究。