题型:填空题 —How far away is it from the airport? 20 kilometers?—No, it's _____. About 30 kilometers away. [ ]A. far B. farther C. the farther D. the farthest 查看答案
题型:填空题 用0.02mol·L-1AgNO3溶液滴定0.1g试样中Cl-(Cl的摩尔质量35.45),耗去了40mL溶液,则试样中Cl-的含量约为()。A.7%B.10%C.28%D.35% 查看答案