问题
多选题
| 下列关于向心加速度的说法中正确的是（ ） A．向心加速度越大，物体速率变化越快 B．向心加速度越大，物体速度方向变化越快 C．在匀速圆周运动中，向心加速度是恒定的 D．向心加速度的方向始终与速度方向垂直 |
答案
BD
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| 下列关于向心加速度的说法中正确的是（ ） A．向心加速度越大，物体速率变化越快 B．向心加速度越大，物体速度方向变化越快 C．在匀速圆周运动中，向心加速度是恒定的 D．向心加速度的方向始终与速度方向垂直 |
BD
| 阅读理解。 | |
She wants to drink some water. She looks and looks. She finds a tap (水龙头). Can the water come out (流出)? Kitty looks into it. But she can't see the water. Where is the water? Kitty wants to drink water and here it comes! The water is coming down (流下来). Kitty can drink water now. 根据短文内容，将下列句子补充完整。 1. It's a ___________ day. 2. Kitty wants some ___________. 3. She finds a ___________. 4. Kitty can't ___________ the water. 5. Kitty can ___________ water now. 6. The cat's ___________ is Kitty. |