下列有关凭证式国债的表述中，错误的是（）。 A.采取"随买随卖"的方式进行交易 B.

某客户持有面值为100万元的商业票据，距离到期期限还有30天，因资金问题，到银行进行票据贴现，银行的商业票据贴现率为6％，则该客户的贴现额为（）

A．905.000 元

B．995.000元

C．995.068元

D．940.000元

轴在局部加热校正时需要有跟原弯曲方向相反约（）的过弯曲值。

A、0.03~0.04毫米；

B、0.04~0.05毫米；

C、0.05~0.06毫米。

停站作业内容是什么？

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.

Lichens may NOT grow ______ .

A．in the tropical woods

B．on the ceilings of city buildings
C．on rocks in hot springs

D．in dry desserts

下列关于咽旁间隙描述错误的是（）

A.较宽大，三角形

B.位于翼内肌、腮腺、脊柱与咽侧壁间

C.上至颅底，下达舌骨平面

D.咽旁前间隙内有颈内动、静脉及Ⅸ～Ⅻ对脑神经

E.为潜在性的疏松结缔组织区域