问题
问答题
如图所示，是用钢丝钳剪铁线的情景，钢丝钳是一个______杠杆（选填“省力”、“费力”或“等臂”），它的刀口做得很薄，其目的是通过______来增大压强．
答案
钢丝钳在使用过程中，动力臂大于阻力臂，是省力杠杆．
钢丝钳刀口做得很薄减小了受力面积增大了压强．
故答案为：省力、减小受力面积．
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如图所示，是用钢丝钳剪铁线的情景，钢丝钳是一个______杠杆（选填“省力”、“费力”或“等臂”），它的刀口做得很薄，其目的是通过______来增大压强．
钢丝钳在使用过程中，动力臂大于阻力臂，是省力杠杆．
钢丝钳刀口做得很薄减小了受力面积增大了压强．
故答案为：省力、减小受力面积．
| Read and choose. 阅读短文，选择正确的答案。 |
| Hello! My name is Zhang Tao. I'm eleven years old. I am in Class Four, Grade Five. I was busy last weekend. On Saturday, I stayed at home all day. I did my homework in the morning and cleaned my room in the afternoon. On Sunday, I visited my friend Jenny. It was her birthday. We danced and sang all morning. Jenny's mother made a birthday cake for us. We went to the zoo in the afternoon. We saw the animals show there. On Sunday evening, I played the piano first, and then watched TV. At ten o'clock I went to bed. |
| 1. —How old is Zhang Tao? —He is years old. |
[ ] |
| A. four B. five C. eleven |
| 2. On Saturday, he stayed at home . |
[ ] |
| A. in the morning B. all day C. in the afternoon |
| 3. was Jenny's birthday. |
[ ] |
| A. Sunday B. Saturday C. In the evening |
| 4. —On Sunday afternoon, where did they go? —They . |
[ ] |
| A. go to the zoo B. went to the zoo C. were at home |
| 5. Did Jenny clean the room? |
[ ] |
| A. Yes, she did. B. No, she didn't. C. We don't know. |