Based on the principle of ester hydrolyzation to ether in alkali condition, the process for preparation of dimethyl sulfide from sodium methyl sulfate residue was investigated.
根据酯在碱性条件下水解反应生成醚的原理，研究了以甲基硫酸钠废渣为原料制备二甲基硫醚的方法。
2
Most of the large canopy culture is done all the year round, the airtight condition is good, the residue question of the agriculture chemical in the soil is more obvious.
大棚栽培多数是长年连作，密闭条件好，土壤中农药的残留问题就更加明显。
3
It(?) proven that this method improves the balancing grade of high speed centrifuge, and decreases the residue unbalance of rotor. Therefore the working condition of rotor is steadily and dependable.