问题
多选题
下列物体中处于平衡状态的是 [ ]
A．静止在粗糙斜面上的物体
B．沿光滑斜面下滑的物体
C．在平直公路上匀速行驶的汽车
D．做自由落体运动的物体在刚开始下落的瞬间
答案
AC
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下列物体中处于平衡状态的是 [ ]
A．静止在粗糙斜面上的物体
B．沿光滑斜面下滑的物体
C．在平直公路上匀速行驶的汽车
D．做自由落体运动的物体在刚开始下落的瞬间
AC
| 选择方框内的词的适当形式填空，每个单词或词组只能用一次。 | |
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| 1. In class we he teacher when she reads the text. 2. I with a pencil in class. 3. Come in and . 4. Can you the door?It's very hot. 5. Wang Dong and reads the text. 6. The teacher asks us to the words in box A with the words in box B. 7. The shop at 9:00 in the evening. 8. At primary school,children learn to and write. 9. I'm going to England this summer,so that I must my English. 10. We'll at the school gate(大门) tomorrow. |