吡咯, 噻酚和呋喃的情况就是这样.Such is the case in pyrrole, thiophene, and furan.研究结果表明关键步骤为原料 4- 甲基 -2, 3- 呋喃二酮的合成.It'shows that the key step is the synthesis of 4 - methyl - dihydro - furan - 2 , 3 - dione.用糠醇和糠醛缩聚制备了新型呋喃树脂.A n...
久旱的禾苗逢甘雨.A sweet rain falls on the parched seedlings.久旱逢甘霖,他乡遇故知.To meet an old friend in a distant land is like refreshing rain after a long drought.久旱不雨、拥挤的沙滩、晒黑的皮肤、栎叶毒漆树、麦当劳快餐馆.Drought . Crowded beaches . Sunburn . Po...
这本书论及医药的进步.This book treats of the progress of medicine.英语是国际贸易 、 电信 、 航空 和 医药的通用语言.English is the language of international business, telecommunications, aviation & medicine.用途: 合成 含氟 类农药,医药的中间体.Use: Intermediate in the...
I had obtained the authentic details about the birth of the organization.我已经掌握了有关该组织诞生的可靠的详细资料。It is crucial that all documents presented are authentic and easily verifiable.所有提交的文件必须真实且易于查证，这一点很关键。They have to look auth...
Annuals, as a general rule , are very responsive to phosphorus fertilization.通常说来,对一年生植物施用磷肥是相当有效的.The simplest way to deal with these hardy annuals is to sow them where they are to flower.处理这些一年生耐寒植物最简单的办法是将他们种在能开花的地方。H...