同义词： Appleton layer F layer
以上来源于: WordNet
N the highest region of the ionosphere, extending from a height of about 150 kilometres to about 1000 kilometres. It contains the highest proportion of free electrons and is the most useful region for long-range radio transmission F电离层 (Also called Appleton layer) → see also ionosphere
Let me call that region D of divergence, of curl F dV.
称之为在区域D上divdV的积分。
So, we'll call that the double integral of our region, R, of f of xy dA and I will have to explain what the notation means.
称之为区域R上fdA的二重积分,会向大家解释这些符号的含义的。
What does it mean to take the average value of some function f in this region r?
在区域r上求函数f的平均值,这是什么意思？
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