机械沉积分异作用是原来混杂在一起的物质沿搬运方向按（）、相对密度大小分批依次沉积。
参考答案：颗粒粗细
根据句意、首字母提示或英文解释完成单词的拼写
1. The a ____ of the story is Lu Xun.
2. We will take some food and drinks for the (an occasion when the food is taken to be eaten
outdoors).
3. ____ (at last), we got to the top of the hill after 2 hours' climbing.
4. My parents are ____ (one and the other; two) teachers.
5. My ____ (like…best) season is spring.
有人说：“光面爆破打不好，是井巷掘进的先天不足”这句话是对是错？
