白化病 蛔虫病遗传病 流感 血友病 色盲传染病．

有下列情形之一的为重大突发中毒事件（II级），除外（）：

A.一起突发中毒事件暴露人数2000人及以上。

B.一起突发中毒事件，中毒人数在100人及以上且死亡2-9人；或死亡10-29人。

C.在一个县（市）级行政区域24小时内出现2起及以上可能存在联系的同类中毒事件时，累计中毒人数100人及以上且死亡2-9人；或累计死亡10-29人。

D.市（地）级及以上人民政府及其卫生行政部门认定的其他情形。

The fossil record shows that the climate of North America warmed and dried at the end of the Pleistocene period. Most of the species of large mammals then living on the continent became extinct, but the smaller mammalian species survived.
Which of the following, if true, provides the best basis for an explanation of the contrast described above between species of large mammals and species of small mammals ？（）

A．Individual large mammals can, in general, travel further than small mammals and so are more able to migrate in search of a hospitable environment.

B．The same pattern of comparative success in smaller, as opposed to larger, species that is observed in mammals is also found in bird species of the same period.

C．The fossil record from the end of Pleistocene period is as clear for small mammals as it is for large mammals.

D．Larger mammals have greater food and space requirements than smaller mammals and are thus less able to withstand environmental change.

E．Many more of the species of larger mammals than of the species of smaller mammals living in North America in that period had originated in climates that were warmer than was that of North America before the end of the Pleistocene period.

国家消亡的条件和途径？

某镇10万人口，2001年全死因死亡1000例。该年结核病患者总数为200人，其中男120人，女80人；结核病死亡40人，其中24例为男性。根据上述资料，该镇2001年结核病的病死率为（）。

A.6%

B.20%

C.4%

D.10‰

E.上述资料不能计算

某建筑采暖系统热用户与热水外网采用间接连接的原因，可能是下列哪几项

A．用户入口处压力超过该用户散热器承压

B．多层建筑群中的高层建筑

C．间接连接比直接连接费用低

D．外网水质不满足用户要求