问题
选择题
Young Tom is one of ______ boys in our class. [ ]
A. careful
B. carefully
C. more careful
D. the most careful
答案
答案:D
Young Tom is one of ______ boys in our class. [ ]
A. careful
B. carefully
C. more careful
D. the most careful
答案:D
每到周末,有大量的骑行爱好的者骑着自行车在松山湖每一个优美的景点之间穿梭,既锻炼身体又能享受大自然的美景.观察如图所示的自行车,完成下列问题:
(1)骑自行车出行的优点是______(填一个即可)
(2)如下表格中的示例,完成表格.
部件 | 用到的物理知识 | |
示例 | 座垫 | 增大受力面积减少压强 |
1 | 车闸手柄 | |
2 | 滚动代替滑动减少摩擦 | |
3 |