提出了一种干柱层析法 分离提纯 试剂对氨基偶氮苯的新方法.A new method for separating and purifying p - AAB ( p - aminoazobenzene ) by dry - column chromatography is developed.偶氮苯侧链液晶聚合物.Azobenzene side - chain liquid crystalline.必须通过偶氮,(苯)酚类,有机氯试剂,...
She was clutching a photograph.她紧紧抓着一张照片。He fell asleep clutching a half - eaten drumstick in his right fist.他右手里紧握着一只吃了一半的鸡腿睡着了.Lili had fallen asleep clutching a fat bunch of grapes.莉莉手里抓着一大串葡萄睡着了。Jessie saw him out. S...
There was an impassable barrier between the white race and the one which they had reduced to slavery.在白色人种和被他们奴役的种族之间有一道不可逾越的障碍。The avenue had never been paved, and deep mud made it impassable in winter.这条大街从未铺过路面，冬天泥泞不堪...
赶快把绑住我的手的绳子解开。Just untie my hands.在这?热?投手投球竟打中了三个击手的头.The pitcher has beaned as many as three batters in this game.棒球比赛时,裁判员站在接球手的身后.An umpire stands behind the catcher in baseball....