FGR哪种情况不适合 * * 分娩（） A.胎盘功能良好 B.宫颈Bishop评分>7分

装于机动车辆上的压缩式空调系统

Lichens may grow on the bark of a tree in a steaming tropical rain forest, on the bricks of big city buildings, on rocks in hot springs, on wind-swept mountaintops, and in the driest desserts. In the arctic, they provide the principal food for caribou, and they are one of the few plants that grow in Antarctica. They are pioneers, appearing in barren rocky areas and starting the formation of soil in which mosses, then ferns, and then other plants can take root.
Lichens are a partnership of two plants — fungi and algae. The lichen body is made up of a network of fungal strands. In the upper layers of these grow groups of algae. The two organisms live together to the benefit of both, a relationship known as symbiosis. The fungi provide support, absorb water, and shelter the tender algae from direct sunlight. The algae carry on photosynthesis and provide the fungi with food. The algae can live independently and are recognizable as a species that grows alone. The fungi, on the other hand, cannot live apart from their partners. They can be placed in known classes of fungi but are unlike any species that lives independently.
So definite are the form, color, and characteristics of these double organisms that for hundreds of years, they were classified as one. More than 15,000 "species" were named. If these organisms are classified as separate species, it is difficult to fit them into the existing system of classification. But if they are classified separately, these species of fungi seem rather strange. Lichens are a splendid example of the difficulties faced by taxonomists in classifying species.

According to the passage, the algae ______ .

A．may not carry on photosynthesis alone
B．supply food to the fungi
C．can’t live separately

D．aren’t recognizable as a species

污水一级处理主要是为了除去

A．有机污染物

B．悬浮固体

C．总固体

D．氮、磷等营养物质

E．细菌

下列选项中，安全预评价内容不包括( )。

A．危险度评价

B．安全对策措施及建议

C．危险及有害因素识别

D．危险分析

几十年以前，欧洲的一种百灵鸟被引入到北美，由于这种百灵鸟的生活习性与当地的一种草地百灵鸟很相似，一段时间后，草地百灵鸟在当地绝迹，这一现象在生物学上称为（）

A.种内斗争

B.竞争

C.捕食

D.人工选择