人生常被喻为一场梦.Life is often likened to a dream.人生可喻为旅途.Life can be likened to a journey.因此种子被喻为事物的根源.Therefore, seed has been hailed as an origin of things....
Purification of 2,6 dichlorotoluene by the recrystallization method without solvent was studied.研究了用无溶剂重结晶法提纯2,6二氯甲苯.Taking p chlorotoluene as raw material , 2,4 Dichlorotoluene was synthesized via catalytic chlorination...
Cholelithiasis may be associated with present or past episodes of either acute or chronic cholecystitis.胆石症可能与现在和过去的急性或慢性的胆囊炎发作有关.Aim To explore the clinical characters of senile cholelithiasis and cholecystitis.目的探讨老年型胆...