题目

After his (recover) from his illness, he continued his work again. 答案：【1】recovery有关实验的叙述，正确的是 A．将固体加入容量瓶中溶解并稀释至刻度线，配制成一定的物质的量浓度的溶液 B．用玻璃棒蘸取溶液点在湿润的PH试纸上测定其PH C．用NaOH溶液洗涤并灼烧铂丝后，再进行焰色反应 D．读取量筒内液体的体积，俯视读数导致读数偏大