光电器件具有可靠性较高结构简单等特点但精度比较低。 - 查题网

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国家开放大学 / 传感器与测试技术

光电器件具有可靠性较高结构简单等特点但精度比较低。

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关于平面任意力系的主矢和主矩，下述说法正确的是（）。(A) 主矢的大小.方向与简化中心无关 (B) 主矩的大小.转向一定与简化中心的选择有关 (C) 当平面任意力系对某点的主矩为零时，该力系向任何一点简化结果为一合力 (D) 当平面力系对某点的主矩不为零时，该力系向任一点简化的结果均不可能为一合力工程力学

56、Without water, there is no life on the earth.统考英语句子翻译

鼻旁窦积液最不易引流的是：系统解剖学

86、在Windows 的“回收站”中，右击某一文件，将会出现______命令。 A.复制 B.粘贴 C.重命名 D.还原计算机统考

关于胸导管的说法正确的是: 53．E 系统解剖学

3、Modern zoos are very different from zoos that were built fifty years ago. At that time, zoos were places _ _ 21 _ _ people could go to see animals from many parts of the world. The animals lived in cages that were made _ _ 22 _ _ concrete with iron bars, cages that were easy to keep clean. Unfortunately for the animals, the cages were small and impossible to hide in. The zoo environment was anything but natural. _ _ 23 _ _ the zoo keepers took good care of the animals and fed them well, many of the animals did not thrive; they behaved in strange ways, and they often became ill. In modern zoos, people can see animals in more natural habitats. The animals are given more _ _ 24 _ _ in large areas so that they can live more comfortably as they would in nature. Even the appearance of zoos has changed. Trees and grass grow in the cages, and streams of water flow _ _ 25 _ _ the areas that animals live in.统考英语完型填空