请看图写出对话。
A:1.______?
B: 2. ______.
1. Is this your pen,
2. No, it isn't. It's his pen
(答案不唯一)
从100张分别写上1~100的数字卡片中,随意抽取一张是7的倍数的概率为______.
压滤机漏料的原因有哪些?