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【简答题】
简述土地生态学的研究内容?
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反馈参考答案：
举一反三
【多选题】系统镇定:保证稳定是控制系统正常工作的必要前提,对受控系统通过反馈使其极点均具有负实部,保证系统渐近稳定。下列正确的说法是()
A.
对系统采用状态反馈能镇定的充要条件是其不能控子系统渐近稳定
B.
对系统通过输出反馈能镇定的充要条件是其结构分解中的能控且能观子系统是输出反馈能镇定的,其余子系统是渐近稳定的
C.
对系统采用输出到x反馈实现镇定充要条件是其不能观子系统为渐近稳定
D.
对系统采用状态反馈能镇定的充要条件是其能控子系统渐近稳定
【简答题】物流功能成本主要包括________________、________________和________________。
【单选题】Which of the sentences below best expresses the information in the highlighted statement in the passage? The other choices change the meaning or leave out important information.
A.
It is the hydrologic cycle that causes water to evaporate from plants, soil, and bodies of water inland as well as from the oceans.
B.
Solar energy is the source of power for the hydrologic cycle, which begins by evaporating water from plants, soil, oceans, and freshwater sources.
C.
The evaporation of water from the oceans, freshwater sources, plants, and soils is the natural process, which we call the hydrologic cycle.
D.
Energy from the sun and the hydrologic cycle are power sources for plants that require water from the oceans and freshwater sources.
【简答题】如果系统受扰动后偏离了原工作状态，扰动消失后，系统能自动恢复到原来的工作状态，这样的系统称为稳定系统，否则为不稳定系统。任何一个反馈控制系统能正常工作，系统必须是（）的。
【单选题】Which prefix below in English holds the most derivation words?
A.
Auto-
B.
Micro-
C.
Semi-
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