Wastewater treatment plants - part 15 : measurement of the oxygen transfer in clean water in aeration tanks of activated sludge plants 污水处理厂.第15部分:活性污泥厂的曝气池清水中充氧的测量
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This is probably because a fetus starved of oxygen will send oxygenated blood to the brain in preference to rest of the body 这可能是因为一个缺乏氧的胚胎会首先把充氧的血液输送到脑部，然后才送到身体的其他部位。
