The speed at point D is 9.0 0 km/s kilometers per second, and I'll Everything else we should be able to calculate now from these numbers.
点D时，速度为0,9。,所有的都可以从,这些数字中算出来。
Therefore, it should also hold D However, at point D, there is something very important.
所以肯定也适用于,但是，在点，也有非常重要的一点。
But I don't believe we're at the point right now to make the recommendation that people should go out and take vitamin d.
但是我不认为现在是我们推荐人们到屋外去并服用维生素d的时候。
But I don't believe we're at the point right now to make the recommendation that people should go out and take vitamin d.
但是我不认为现在是我们推荐人们到屋外去并服用维生素d的时候。
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