武松在谁的帮忙下打扮成行者模样？（）A、张青夫妇B、顾大嫂C、扈三娘D、鲁智深

患儿，9岁，右下后牙肿痛。检查：右下第二乳磨牙冠大部分破坏，龋洞较深，叩诊（+），松动Ⅱ度。颊侧牙龈处有0．5mm×0．5mm脓肿。X线片示：牙根吸收1／3，根分歧有低密度影。右下第二前磨牙牙根形成2／3。

如果治疗后，右下第二乳磨牙仍然松动且X线发现，右下第二前磨牙牙胚牙囊骨壁有破坏，应作的处理是（）

A.开放，定期换药

B.完善根管治疗

C.拔除，做功能矫治器

D.拔除，不需要做保持器

E.拔除，做保持器

当（）着火时，可以用水作为灭火剂。

A：铝粉

B：硫磺

C：碳化钙（电石）

应用带有两位小数的“货币”格式（负数放在括号中）的快捷键是（）。

A.Ctrl+Shift+$

B.Ctrl+Shift+&

C.Ctrl+Shift+!

D.Ctrl+Shift+：

Researchers have found that when very overweight people, who tend to have relatively low metabolic rates, lose weight primarily through dieting, their metabolisms generally remain unchanged. They will thus burn significantly fewer calories at the new weight then do people whose weight is normally at that level. Such newly thin persons will, therefore, ultimately regain weight until their body size again matches their metabolic rate.
The conclusion of the argument above depends on which of the following assumptions

A．Relatively few very overweight people who have dieted down to a new weight tend to continue to consume substantially fewer calories than do people whose normal weight is at that level.

B．The metabolisms of people who are usually not overweight are much more able to vary than the metabolisms of people who have been very overweight.

C．The amount of calories that a person usually burns in a day is determined more by the amount that is consumed that day than by the current weight of the individual.

D．Researchers have not yet determined whether the metabolic rates of formerly very overweight individuals can be accelerated by means of chemical agents.

E．(E) Because of the constancy of their metabolic rates, people who are at their usual weight normally have as much difficulty gaining weight as they do losing it.

设备缺陷分为哪几类？如何管理？