简述石灰抑制黄铁矿的作用机理。

如表1所示，在某DHCP客户机上捕获了六个报文，并对第五条报文进行了解析，请分析相关信息回答下列问题：

客户机获得的IP地址是（）。

第二卷（共两节，满分45分）

I. 短文改错（共10 小题；每小题 1分，满分10分）

Mr Huang is sixty years old. He has retired. He taught our                            76. ____  

Chemistry when we were in Senior Grade One. He was old, and             77. ____

he taught very well. He tried his best to make his classes live. Mr           78. ____  

Huang usually made good preparation for the lessons and was                       79. ____  

strict with us too. Each time we made mistakes in our homework.                 80.____

he would ask us to correct them. At time, I was rather poor in               81.__

chemistry. Mr Huang often helps me with my study very                       82.____      

Patiently. With his help, I made a great progress and caught                   83. ___        

up the class. He was always very kind to every student. As                     84. ____      

an experiencing teacher, he was respected and loved by all                     85. ___  

the students

有减少呼吸道分泌作用的麻醉前用药是()。

A．阿托品

B．苯巴比妥钠

C．地西泮(安定)

D．哌替啶

E．氯丙嗪

( )铁路主通道的建设改革任务主要包括：新建、续建项目；部分铁路复线建设；电气化改造；重点城市间扩能建设和改造；客运专线建设等。

A．三纵两横
B．五纵七横
C．八纵八横
D．六纵六横

《学记》上说“不陵节而施”，这句话体现了( )

A．循序渐进的教学原则
B．启发性教学原则
C．因材施教的教学原则
D．巩固性教学原则