单选题
发布日期:2021-03-22
excessive fuel nozzle holder cooling
sediment in the fuel supply
distortion of the fuel spray pattern
improper atomization of the fuel
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如图所示的实验装置,在一洁净的玻璃片的上表面上放一滴油,当油滴展开成油膜时,在波长λ=6000Å的单色光垂直照射下,从反射光中观察到油膜所形成的干涉条纹。实验中,是由读数显微镜向下观察油膜所形成的干涉条纹。如果油膜的折射率n=1.20,玻璃的折射率n′=1.50,试求:(1)当油膜中心的最高点与玻璃片的上表面相距h=12000Å时,描述所观察到的条纹的形状,即可以观察到几条亮条纹,亮条纹所在处油膜的厚度是多少?中心点的明暗程度又如何?(2)当油膜逐渐扩展时,所看到的条纹将如何变化?
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以下几组软件中,均属于系统软件的是()。
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