Its metallation and addition to cyclopentanone proceeded well to 40.其金属取代物能和环戊酮顺利地反应得到40.Cyclopentanone ethylene ketal was synthesized with I _ 2 as catalyst.以单质碘为催化剂合成了环戊酮乙二缩酮.Methyl dihydrojasmonate was synthesized fro...
人造丝比天然丝更易起皱 吗 ?Does artificial silk crease more easily than natural silk?羊毛比人造丝厚实.Wool has more body than rayon.人造丝是仅次于棉花的使用得最广泛的织物。Rayon rank second only to cotton as the most widely used fiber....
The sea wall sustains the shock of the waves.海堤能抵挡海浪的冲击.The breakwater sustains the shock of the great waves.防波堤承受巨浪的冲击.This novel sustains the reader's interest to the end.这部小说使读者到最后都依然兴趣浓厚....