【简答题】A young man was one day taking a walk with a professor. As they went along, they saw 36 in the path a pair of old shoes. They guessed the shoes belonged to a poor man who had 37 finished his day’s ...
【判断题】为配制 T (Fe / K 2 Cr 2 O 7 ) = 0.005000 g / mL 的 K 2 Cr 2 O 7 标准溶液 1 L ,需称取纯 K 2 Cr 2 O 7 4.389g 。 [ M r (K 2 Cr 2 O 7 ) = 294.18 , A r (Fe) = 55.85 ]