【判断题】佛尔哈德法的剩余滴定法中,测定溴化物或碘化物时,由于AgBr和AgI沉淀的溶解度都比AgSCN沉淀的溶解度小,则不必加有机溶剂。
【单选题】Mr. Stone sat tight-lipped, until toward the end when he slowly turned to the right and then to the left, looking at each of us in turn as if he wanted to _________ the picture on his mind.
【判断题】营业现金净流量的计算与折旧没有任何关系。
【单选题】Mr. Smith, with the result of the experiment, sat on the chair, smiling.
【单选题】患者,女性,34岁,胸外伤后呼吸困难,发绀,脉快,体检时见左胸壁有一个约3cm长的开放性伤口,呼吸时伤口处出发嘶嘶声,左侧呼吸音消失,叩诊呈鼓音。对该患者的紧急处理方法是
【单选题】The girl sat there, still. It seems as if she _______ a stone.
【单选题】The beautiful stone _________ as much as 2.5 tons was placed in Mr. White’s garden last week.
【判断题】理论上,只需要杂合子的适合度略微高于两种纯合子,平衡选择就会发生。