实验室购买了一批规格为“2.5V 0.75W”的小灯泡,小明利用其中一只灯泡做测量小灯泡电功率的实验.
— I haven't got the reference book yet, but I'll have a test on the subject next month.
— Don't worry. You _______ have it by Friday.
如图所示的工具中,正常使用时属于费力杠杆的是( )