而且, 这一目标或许要早于防止污染.Indeed, this strand may well predate the anti - pollution effort.在世界上大部分地区, 以重量表示价值的金属作为货币使用早于硬币.Metal, valued by weight, preceded coins in many parts of the world.测色学的基本概念早于1853年由格腊斯曼加以阐述.The basic con...
Magnetometer Device used to detect metal objects.磁性检测机检测金属物品的设备.CCM - 4 - magnetometer to measure the magnetic field is the vertical component of the fluxgate magnetometer.CCM -4 型磁力仪是测量地磁场垂直分量的磁通门磁力仪.Operation principle...
Mammals damage orchards on every continent by girdling roots.哺乳动物在各地对种子园的危害是咬断根系.The ? ing girdling process weakens the trees, it.这个带状剥树皮的过程伤害了树.The clusters respond well to acid or cane girdling to improve cluster compa...