请描述航空母舰的两种用途。
数字证书有两种用途：建立所有者的身份，以及让所有者公钥可用。
A digital certificate serves two purposes: it establishes the owner's identity, and it makes the owner's public key available.
在单一环境中使用两种功能，该服务只能使用一次，因为它们都是为特定的用途设计的。
With both functions in a single environment, the service could be used only once, for the specific purpose it was designed for.
这两种标准集成到了世界上的所有桌面中，工程师们一直在努力拓展其用途，使您能够利用它们做更多的事情。
Both of these standards are integrated into every desktop in the world, and engineers are extending what you can do with those technologies continuously.
有两种用于特殊用途的动态MBeans子类型，如表2 所示
There are two subtypes of Dynamic MBeans for special purposes, shown in Table 2
这两个工具提供的信息对于一般的故障诊断有两种用途
The information provided by these two facilities is useful for general troubleshooting in two ways
我们移除了冗余的控制流连接，并添加了一个新的业务项，即A-prime，以便将项目 A 的两种用途区分开来。
We removed the redundant control-flow connections and added a new business item, A-prime, to distinguish the two purposes of the item A.
恰是因为原材料的共性，才使这两种板材有很多相似的功用，而且很多方面的用途都是一样的。
Just because the commonness of raw materials, to make the two plates has many similar function, and many aspects of the purpose is the same.
一般而言两种渗氮方法的用途是类似的。
In general the USES of the two-nitriding processes are similar.
充气轮胎又分为有内胎式和无内胎式两种。轮胎的充气量取决于轮胎的种类和用途。
Pneumatic tires are of two types, those using an inner tube and the tubeless type. The amount of air pressure used depends on the type of tire and operation.
这两种量度稍有不同，有不同的用途。
当谈到内部的事情，最常见的两种用途，将是消化问题，和咳嗽。
When it comes to internal things, the two most common USES would be for digestive problems, and coughs.
本文着重介绍了两种基本原子模型的用途、研究现状及其发展趋向。
The uses, status and tendency of the two essential atomic models were presented emphatically.
但其控制方式的选用应遵循经济、合理、可靠的原则，可根据其用途的不同，采用两种不同的控制和防干磨擦保护的方式。
The selection of its control mode should follow the economy, fair and reliable principle and two different modes of control and dry running protection are applied for different uses.
介绍两种适用于分批精馏及多用途填料塔的液体分布器——槽式和双排管式高弹性液体分布器。
Two kinds of liquid distributors, with high turndown ratio, for batch distillation and multi-purpose packed columns are described in this paper.
本文介绍在生命科学仪器中最常见的两种生物芯片，以及它们的制作过程、检测方法、用途和发展前景。
In his review. we introduce two most typical biochips and their fabrication processes. detection methods. usage and prospect of applications in the life science instruments.
采叶分为提取黄酮和制作茶叶两种用途，具有不同的采摘标准。
There are different leaf picking standards for tea production and flavone extraction.
本发明涉及两种二聚桔霉素类化合物的制备方法和用途。
The invention relates to a preparation method and a use of two dimer citrinin compounds.
本发明涉及两种三聚桔霉素类化合物的制备方法和用途。
The invention relates to preparation methods and applications of two trimeric citrinin compounds.
本文研究了马铃薯淀粉生产废液、废渣的两种回收利用途径。
Two methods of potato starchy processing waste were tried in this paper.
此方法具有两种用途，一种是允许使用数据源中的数据刷新对象上下文中的对象，另一种是作为解决冲突的机制。
This method has the dual purpose of allowing objects in the object context to be refreshed with data from the data source, and being the mechanism by which conflicts can be resolved.
但这两种景观建筑师都重视滨水空间的历史用途，从几个世纪以来的海岸线活动中汲取灵感。
But both landscape architects turned to the historical USES of their waterfront sites, drawing inspiration from the shoreline activities of centuries past.
本发明涉及两种异黄酮类化合物的制备方法及其抗肿瘤与抗植物病菌用途。
The invention relates to a method for preparing two isoflavone compounds and application of resisting tumor and plant germ.
特点及用途：用于磨制橡胶、塑料或类似的试片至一定的厚度供其他试验设备进行试验之用，具有精细两种砂轮同时工作之优点。
Features and use: It is used for abrading rubber, plastic or the same kind material like them. has the advantage of two grinding wheel working at the same time.
本产品为一般用途起重机，多用于露天场所及仓库的装卸或抓取物料，本产品有地面操纵和室内操纵两种型式。
This product is a regular crane widely used at open ground and warehouses to load, unload or grab materials. It has 2 controlling methods, namely, ground controlling and room controlling.
本产品为一般用途起重机，多用于露天场所及仓库的装卸或抓取物料，本产品有地面操纵和室内操纵两种型式。
This product is a regular crane widely used at open ground and warehouses to load, unload or grab materials. It has 2 controlling methods, namely, ground controlling and room controlling.
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