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当前学科：空气动力学
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造成飞机高速飞行空气动力特性不同于低速飞行的主要原因是（）。
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Spiritual Bond Besides, do not forget to appreciate the ''spiritual bond'' between people. I've met numerous people in Japan, the US, and Australia. In the beginning, I was __1__ by the differences in the views and cultures. After studying in the US, I got __2__ to the American way of thinking. So when I first moved to Australia, I had __3__ thoughts about Australians, I thought they were quiet and passive. I felt that I couldn't understand them and that I didn't __4__ in. That is when I met the Happy Science teachings. I learned about how people go through reincarnation （转世） and are born again and again in different races and in different countries. Therefore, I realized that the people I meet in this lifetime are __5__ connected to me from my past. We have known each other before. When I __6__ this spiritual perspective, I reflected on my narrow-Mindedness. When I found out that people who I thought I couldn't understand could be spiritually connected to me, I felt __7__ even for people I used to __8__ .I felt a feeling of oneness and I was able to make many friends creating bonds of understanding and respect. Value and __9__ every spiritual bond between you and the people you meet and continue to work hard to develop yourself in order to __10__ others and be a good influence. __1__内应填（） __2__内应填（） __3__内应填（） __4__内应填（） __5__内应填（） __6__内应填（） __7__内应填（） __8__内应填（） __9__内应填（） __10__内应填（）
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与过敏反应相关的白细胞主要是嗜酸性粒细胞和嗜碱性粒细胞。
四部分类法是如何确立的？