220KV 母线地刀和母线互感器地刀编号为多少?有什么作用?

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220KV 母线地刀和母线互感器地刀编号为多少?有什么作用?

考点:临床执业医师运行专业运行专业题库
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“两闭锁”指风电闭锁,()。

A、风门闭锁

B、瓦斯电闭锁

C、探头与电源开关闭锁

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About fifty years ago, plant physiologists set out to grow roots by themselves in solutions in laboratory flasks. The scientists found that the nutrition of isolated roots was quite simple. They required sugar and the usual minerals and vitamins. However, they did not require organic nitrogen compounds. These roots got along fine on mineral inorganic nitrogen. Roots are capable of making their own proteins and other organic compounds. These activities by roots require energy, of course. The process of respiration uses sugar to make the high energy compound ATP, which drives the biochemical reactions. Respiration also requires oxygen. Highly active roots require a good deal of oxygen.
The study of isolated roots has provided an understanding of the relationship between shoots and roots in intact plants. The leaves of the shoots provide the roots with sugar and vitamins, and the roots provide the shoots with water and minerals. In addition, roots can provide the shoots with organic nitrogen compounds. This comes in handy for the growth of buds in the early spring when leaves are not yet functioning. Once leaves begin photosynthesizing, they produce protein, but only mature leaves can "export" protein to the rest of the plant in the form of amino acids.

The scientists found what the isolated roots need is ______.

A.quite natural

B.sugar, minerals and vitamins

C.some rare vitamins

D.organic nitrogen compounds

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1964年在()奥运会上,柔道成为正式的奥运会比赛项目。

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属于补体系统缺陷的疾病是()

A.Digeorge综合征

B.慢性肉芽肿

C.严重联合免疫缺陷病

D.遗传性血管神经性水肿

E.AIDS

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《铁路信号维护规则》对计算机联锁系统对环境有什么要求?

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