问题
选择题
如图所示，是汽车牵引力F和车速倒数 的关系图象，若汽车质量为2×103kg，由静止开始沿平直公路行驶，阻力恒定，最大车速为30m/s，则以下说法正确的是（ ） |
|
A．汽车的额定功率为6×104W B．汽车运动过程中受到的阻力为6×103N C．汽车先做匀加速运动，然后再做匀速直线运动 D．汽车做匀加速运动时间是6s |
答案
答案：A
搜题请搜索小程序“爱下问搜题”
| 如图所示，是汽车牵引力F和车速倒数的关系图象，若汽车质量为2×103kg，由静止开始沿平直公路行驶，阻力恒定，最大车速为30m/s，则以下说法正确的是（ ） |
|
A．汽车的额定功率为6×104W B．汽车运动过程中受到的阻力为6×103N C．汽车先做匀加速运动，然后再做匀速直线运动 D．汽车做匀加速运动时间是6s |
答案：A
| 完型填空。 | |||
| Today is Sunday.Joy's family are all 1 home. Her father, Mr Green, is sitting 2 a chair and 3 a book. Joy is in 4 room..She is listening 5 the tape. Tom and Jim are 6 brothers. They are cleaning 7 bedroom. 8 is Mrs Green? She 9 the flowers in the garden. Joy's sister Mary is 10 her mother. | |||
| ( )1. A. to ( )2. A. on ( )3. A. looking ( )4. A. she ( )5. A. for ( )6. A. their ( )7. A. her ( )8. A. Where ( )9. A. water ( )10. A. helps | B. at B. at B. seeing B. her B. at B. Mr Green's B. his B. Who B. to water B. to helps | C. for C. with C. reading C. hers C. to C. Mrs Green's C. they C. What C. watering C. helping | D. in D. for D. having D. she's D. about D. Joy's D. their D. How D. is watering D. help |