问题
填空题
推料板向前推烟料时对烟料有一个推动作用，而向后拉开时则没有推进，两个过程烟料前进的速度不一样，当推料板摆幅大、（）低时，其作用更明显。
答案
参考答案：频率
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推料板向前推烟料时对烟料有一个推动作用，而向后拉开时则没有推进，两个过程烟料前进的速度不一样，当推料板摆幅大、（）低时，其作用更明显。
参考答案：频率
| 补全对话。 | |
| A: Could I speak to Susan, please? B: Speaking, please. A: This is Paul. 1 B: Fine, thank you. 2 A: I'm in London. I'm at my aunt's home. B: Oh, what's the weather like there? A: It's terrible. 3 B: What are you doing now? A: 4 How's the weather in Taiyuan? B: It's sunny. I'm playing baseball with Jeff. A: Jeff? Your pen pal from Shanghai? B: Yeah! He comes to see me today. A: 5 B: Thank you.
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