4-membered
英
美
[网络] 4元
双语例句
- An unsaturated 4-membered nitrogenous and phosphorous heterocycle has been synthesized and characterized. THE HYDROGENATION OF UNSATURATED COMPOUNDS OVER SUPPORTED PALLADIUM CATALYSTS
合成了含氮、磷四元不饱和化合物.负载型钯催化剂用于不饱和化合物的加氢反应