并把下面的字母代号写在上面的方框中。
扼要介绍了欧洲（AECMA）规定采用的金属材料牌号九位字母与数字的表示方法，也介绍了金属材料状态的字母代号表示方法，并给出了一些示例。
The designation system of metallic materials in AECMA was introduced in this paper. The coding of conditions in metallic materials was also presented. And some examples were shown.
为了轻易识别出那些配置将被应用到哪一个项目中，配置的名称就要以项目代号的起头两个字母作为前缀。
To easily identify which projects those configurations apply to, the configuration name is prefixed with the first two letters of the project code name.
因此，五角大楼方面在1972年制定了第一准则用来限制代号的命名，并于1975年建立了两个字母的取名系统。
As a result, the Pentagon issued its first guidelines restricting how nicknames can be formed in 1972 and created the two-letter system in 1975.
每一个由国防部大型作战行动命名设备决定的作战代号名称，都是由两个字母构成一个字母群再使其组成“两个单词构成的系列代号”。
Each command within the vast Defense Department apparatus is given a series of two-letter groupings that they can use for their operations’ two-word sobriquets.
每一个由国防部大型作战行动命名设备决定的作战代号名称，都是由两个字母构成一个字母群再使其组成“两个单词构成的系列代号”。
Each command within the vast Defense Department apparatus is given a series of two-letter groupings that they can use for their operations' two-word sobriquets.
双字母命名系统并不是命代号名的唯一途径。
The two-letter system isn't the exclusive way to pick an operation and exercise names.
如果你能提供3- 4位数的字母，数字代号，位于底部的包装，这将使我们能够确定生产日期。
If you can provide the 3-4 digit alpha-numeric code located on the bottom of the packaging, this will allow us to determine the date of manufacture.
如果你能提供3- 4位数的字母，数字代号，位于底部的包装，这将使我们能够确定生产日期。
If you can provide the 3-4 digit alpha-numeric code located on the bottom of the packaging, this will allow us to determine the date of manufacture.
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