【简答题】称取纯的KCl和KBr的混合样品0.3056g,溶于水后,以K 2 CrO 4 为指示剂,用c(AgNO 3 )=0.1000mol/L的AgNO 3 标准滴定溶液滴定,终点时用去30.25mL,试求该混合物中KCl和KBr的质量分数。
【单选题】Mike has got three brothers and two sisters,_____he has got a big family.
【判断题】一个信号可以既是能量信号,也是功率信号。
【简答题】___用于解决机动车对向行驶的矛盾。适用于机动车交通量大、车速要求高,非机动车类型较单纯且数量不多,用于联系远郊区之间的快速干道。由于这种断面车辆行驶灵活性差、车道利用率不高。宽度不够时,往往因超车造成事故。
【简答题】Task 4 Mike Li is going through the customs security check. Listen to the conversation and fill in the blanks with what you hear. Mike is going through the customs security check. First, he shows his ...
【简答题】以银电极为指示电极,双液接饱和甘汞电极为参比电极,用 0.1000 mol/L AgNO 3 标准溶液滴定含 Cl - 试液,得到的原始数据如下 ( 电位突越时的部分数据 ) 。用二阶导数法求出滴定终点时消耗的 AgNO 3 标准溶液体积。 滴加体积 电位 E/V △ E △ V ∆ 2 E/∆V 2 24.10 0.183 24.20 0.194 24.30 0.233 24.40 0.316 ...
【单选题】Mike has got used_-up late at night. (stay up) A. to sit B. X C. to sitting D. sitting