下列句中各有一处错误，指出并改正。

1. He lives nearest to the school,so he has the short journey.

2. Betty is friendly with us.

3. He is born in Shanghai in 1998.

4. Do you see the chair have three legs?

10GV2中，主控板和单板通信必须通过（）板，每块单板分配一个IP地址，分配原则为（）；主控板（23）IP为（）。当交叉板、主控板不在位时（）PING通其他单板，计算机通过直连网线直接与ACOM板相连。