1.1本规范涵盖了重熔用锭棒形式的镁:9980A有锭棒形式，9980B、9990A、9995A和9998A通常只有锭形式。 1.2以国际单位制表示的数值应视为一个单独的标准。每个系统中规定的值不是精确的等效值，因此每个系统必须独立于其他系统使用。

1.1 This specification covers magnesium in the form of ingot and stick for remelting: 9980A is available in ingot and stick form, and 9980B, 9990A, 9995A, and 9998A are generally available only in ingot form. 1.2 The values stated in SI units are to be regarded as a separate standard. The values stated in each system are not exact equivalents, therefore each system must be used independently of the other.