预抽
参考答案:
抽放未受采动影响和未经人为松动卸压煤(岩)层的瓦斯。
Read and answer the questions. 阅读短文,回答问题。
It's a sunny day, the birds are singing in the garden. My grandmother is sleeping in her arm-chair. A book
is in her hand. And she is wearing glasses. Her cat is sleeping beside her feet. The butterflies (蝴蝶) are flying
around it, beautiful picture!
1. Where is my grandmother?
2. What is she doing?
3. Is she wearing glasses?
4. Where is her cat?
图为A、两个小球向右运动过程的频闪照片。它记录了两小球在相等的时间间隔所处的位置。以下对A、B两个小球运动情况的判,正确的是
A.小球A、B都做匀速运动
B.小球A做匀速运动,小球B做变速运动
C.小球A、B都做变速运动
D.小球A做变速运动,小球B做匀速运动