简述煤层群分组一般应遵循的原则？

患牙咬合面有深的龋洞，平时没有疼痛，有食物嵌入后剧烈疼痛，探诊可探及穿髓孔引起剧烈的疼痛，叩诊患牙有不适感，表明

A．牙髓正常
B．牙髓坏死
C．可复性牙髓炎
D．牙髓钙化
E．慢性牙髓炎

缺词填空

Dear chairman,

     We are writing to you about p   1   wild animals. Tigers are big and s    2    . They have very bright

eyes. They are in danger because people like to hunt them for fur and make m   3    from their bones.

Wolves have very good eyesight and h   4    and smell. They are usually friendly t    5    each other. They

never hunt people. They do not kill for f     6    . Wolves are also in danger because they have n   7  to

love. If we do nothing for them. Soon their n    8   will be smaller and smaller and we won’t see them in

the near f    9   .

     We think we s    10   help these animals.

                                                                                                                                   Yours sincerely 

                                                                                                                                   Lucy King

1._____ 2._____ 3._____ 4._____ 5._____

6._____ 7._____ 8._____ 9._____ 10._____

学校实验室里的温度是28℃，芳芳将一支温度计从装有酒精的瓶中取出，发现温度计的示数（　　）

A．下降

B．上升

C．先下降后上升

D．先上升后下降

依据《执业药师资格制度暂行规定》，执业药师继续教育实行（）。

A.考核制度

B.考试制度

C.核准制度

D.登记制度

E.注册制度

近代中国的民族工业呈现出“一流价格，二流设备，三流产品”的不正常现象，其中的主要原因是

A．缺少必要的资金

B．缺乏先进的投资方式

C．劳动力素质较低

D．设备和技术受制于外国