选煤厂经常使用的筛分机械有()、()、()、()、()等类型。
参考答案:固定筛、滚轴筛、滚筒筛、摇动筛、振动筛
看图读句子,填上单词把句子补充完整。
1. It's 9:20. Amy has an ____ class.
2. It's 8:15. Amy has a ____ class.
3. It's 11:05. Amy has a ____ class.
4. It's 1:35. Amy has a ____ class.
5. It's 10:10. Amy has an ____ class.
某车间1月份生产产品7 000个,3月份生产产品8 470个,求车间在这两个月生产产品的月平均增长率为多少?