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如果一个函数存在原函数，则其原函数是
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Virtual-reality (VR) headsets are now being used in many industries as a way of training people or providing a new way to experience things.Theater audiences can already enjoy 3D movies, and with apps users can be even more deeply___1___in their movie experiences. They can watch movies on a huge virtual screen, something like their own___2___theater, or even watch as if they were inside the movie itself,___3___by the imagery and sound effects. And if you are a sports fan, a virtual-reality platform company has built a virtual stadium so you can have the___4___of game day experiences with your friends, right from the comfort of your couch.The health care___5___has been a big adopter of virtual-reality tech, with some institutions using the computer-generated images fordiagnosisand___6___.The virtual models help both new and experienced___7___determine the safest and most___8___way to locate tumors, place surgical incisions or practice difficult procedures ahead of time.Besides, virtual reality could add a lot of culture to our lives. A number of museums have already___9___with developers to create virtual spaces where people can___10___the museums’ physical collections.
频率计算中配线法的实质是认为样本的经验分布与其总体分布相一致。
现行水文频率计算配线法的实质是什么？简述配线法的方法步骤？
煤成焦过程中哪个阶段是以物理变化为主（）
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