题目

阅读短文,判断正(T)误(F). Dear e-friends, My name is Tom. I’d like to tell you about my own weekends. I usually get up 7 o’clock on Saturday and Sunday. I exercise near my home for about half an hour. Then I eat my breakfast. I do my homework in the morning. After lunch, I have a short rest. I help Mum with housework in the afternoon. I clean the house and water the flowers in the garden. At 4 o’clock p.m. , I sometimes play football on the playground or fly kites. In the evening, I watch TV together  with my parents. I go to bed at 9 o’clock. I think it is good to go to b某同学用托盘天平称量5.4g某物质时，错把物质和砝码的位置放颠倒了，则该同学实际称得的物质的质量是______g．