mass concentration معنى"mass concentration" أمثلة على "mass" معنى "concentration" معنى "mass concentration (astronomy)" معنى "mass concentration (chemistry)" معنى "concentration" معنى "background concentration" معنى "chemical concentration" معنى "concentration area" معنى "concentration basin" معنى "concentration boundary" معنى "concentration camp" معنى "concentration factor" معنى "concentration gradient" معنى "concentration inequality" معنى "concentration level" معنى "concentration of troops" معنى "concentration period" معنى "concentration platform" معنى "concentration point" معنى "concentration zone" معنى "economic concentration" معنى "effective concentration" معنى "emission concentration" معنى "environmental concentration" معنى "equivalent concentration" معنى أمثلة Such mass concentrations ("mascons") can send a manned mission dangerously off course in the final minutes of a Moon landing when aiming for a relatively small landing zone that is smooth and safe.
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