dry level surface 干的水平表面
flat level surface 水平地板面
mean sea-level surface 平均海水面
geomorphological level surface 地貌水准面
reference level surface 参考水准面
surface level [测] 水面水准 ; [物] 表面能级 ; 地表水准 ; 水平面
It's going to be tangent to the level surface, right?
它是与等值面相切的,对不对?
We have seen that the gradient is perpendicular to the level surface.
我们已经知道,梯度是垂直于等值面的。
Then you know that the gradient of g is perpendicular to the level surface.
那么就知道了g的梯度,是垂直等值面的。
The land surface pokes just a couple of meters on average above sea level, making it the lowest-lying nation in the world.
VOA: standard.2009.10.17
So, one difference between photoelectron spectroscopy and, for example, the photoelectric effect is that in this case, we're not just looking at one energy level, which is what we were looking at from the surface of a metal, now we're talking about this gaseous atom.
光电子能谱与光电效应的不同点在于,以这种情况为例,我们不只关心一个能级,就像原来在金属表面那样,现在我们研究的是气体原子,所以,我们可以从原子中。
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