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简述电信产品的不可感知性特点。
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为什么液化石油气装车要设置气相返回线？
You create a Web application. The Web application enables users to change fields in their personal profiles. Some of the changes are not persisting in the database. You need to raise a custom event to track each change that is made to a user profile so that you can locate the error. Which event should you use? （）
平面划线是用划线工具将图样按实物大小1∶2划到零件上去的。
样冲用于划好的线条上打出小而均匀的样冲眼，以免零件上已划好的线在搬运、装夹过程中因碰、擦而模糊不清，影响加工。
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