某项目建设期内第一年贷款为4000万元，第二年贷款为1020万元，贷款在每年内均衡发

叠氮酸（HN₃）与醋酸酸性相似，下列叙述中错误的是（）

A．HN₃水溶液中粒子浓度大小顺序为：c(HN₃)>c(H⁺)>c(N^-3)>c(OH^-)

B．HN₃与NH₃作用生成的叠氮酸铵是共价化合物

C．NaN₃水溶液中离子浓度大小顺序为：c(Na⁺)>c(N^-3)>c(OH^-)>c(H⁺)

D．与CO₂含相等电子数

正常男性的背拉力指数应为（）

A.50％～100％

B.100％～150％

C.150％～200％

D.200％～250％

E.250％～300％

蒸汽辅助重力泄油

重症社区获得性肺炎最常见病原体是（）

A.肺炎链球菌

B.金黄色葡萄球菌

C.绿脓杆菌

D.肺炎支原体

E.厌氧菌

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.

Which of the following is an example of symbiosis as it is described in Paragraph 2

A．Certain types of tall grass conceal tigers because of the tigers’ striped markings.
B．Fish called remoras attach themselves to sharks and eat the scraps of the sharks’ meals.
C．Mistletoe, a type of shrub, grows on trees and harms them by extracting water and nutrients.
D．Protozoa in the intestines of termites digest the cellulose that the termites eat, and their waste products nourish the termites.