患者，36岁，男，右足底黑痣迅速增大，表面溃烂1个月。手术切除送检。镜下如图所示，真

市场营销学认为产品是五个层次组成的有机整体，属于这五个层次的有（）。

A、实质产品

B、期望产品

C、盈利产品

D、可用产品

（）教授是我国职业医学的先驱者和奠基人。

A、吴执中

B、吴阶平

C、何凤生

D、周恒铎

词汇运用：

小题1:When a person in _________ is away, people will do as they like.(权力)                                  

小题2:Do you like the books _________ by Jin Yong? (写)

小题3:The boy turned around and looked at me _________(吃惊) .

小题4:By the end of the ________century, the world population had passed 6 billion. (20)

小题5:A map of the world was _________to me and I was asked many questions. (展示)

小题6:You mustn’t get off the bus until it _______ completely. (停止)

小题7:Her ________patience made her popular among the students. （end）

小题8:China has 4 great ________in ancient times. (invent)

小题9:We suggested not  ________ a boat trip. (take).

小题10:His whole life has been devoted to ________the origin of cancer .(study)

在确定子网掩码时，需要考虑子网数、主机数和网络类型，请问在A类、B类网络中，当子网位数为4位时，其子网数、主机数和子网掩码分别是什么？

焦炉煤气主要有哪些性质？