— Can I use your notebook computer this afternoon? ________ is under repair.
— No problem.
A:My
B:Mine
C:Me
D:I
①将NaOH固体放在纸上称量,再转移到烧杯中溶解
②烧杯中NaOH溶液移入容量瓶后没有洗涤烧杯
③实验用的容量瓶洗净后末干燥,里面含有少量水
④读取容量瓶液面时采用俯视.
Progress suggests a person's ability to change the way he is living at the moment and it must ______ a better life and a better way of doing things.