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问题 单项选择题

污水处理设备中曝气设备安装时，如曝气头或穿孔管安装不水平，在同一水池中，会出现充氧不均匀的情况，会影响（）处理效果。

A.氧化

B.生化

C.物理

D.化学

答案

参考答案：B

单项选择题

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.
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单项选择题

下列对国内工程咨询市场的描述不正确的是( )。

A．“谁投资，谁决策，谁受益，谁承担风险”将成为投资项目管理的基本原则
B．项目招投标、合同管理、项目监理等咨询业务已经开始市场化运作
C．咨询业今后更注重行业发展规划，从资源、布局统一规划
D．随着投资融资体制改革，投资融资咨询市场会有较快发展
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