[单选题]断路器灭弧室爆炸，检查时如需进入室内，应开启所有排风机进行强制排风（），并用检漏仪测量SF6气体合格，用仪器检测含氧量合格
A.10分钟
B.15分钟
C.30分钟
D.60分钟

[单项选择]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.

[单项选择]有关血浆增容剂（均为6%浓度）的胶体渗透压哪项是错误的（）
A. Has450能产生58.5cmH₂0的胶体渗透压
B. Dextran40能产生125.0cmH₂0的胶体渗透压
C. Dextran70能产生108.1cmH₂0的胶体渗透压
D. Hes40能产生77.6cmH₂0的胶体渗透压
E. Pls能产生23.2cmH₂0的胶体渗透压