根据2012年冀教版八年级英语上册Unit1《Me and My Class》课本P2的第一篇电子邮件回答下列问题。

1. Who is this E-mail from?

    ________________________________      

2. Who is this E-mail to?

    ________________________________

3. What Grade is Li Ming in this year?

    ________________________________

4. How many classes does every grade have?

    ________________________________          

5. What's the date of this E-mail?

    ________________________________

用端铣刀铣阶台面，比较适合于加工有较宽水平面的阶台。由于铣刀直径大，长度小，可取较大的切削用量，故生产效率高。