Deadweight testers are the basic primary standard for accurate measurement of pressure.

自重测试仪是基本的测量压力设备。

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There are several basic features missing such as a standard way to define a primary key using database sequence and EJBQL is very limited.

许多基础的特征未考虑到，比如使用数据库序列和EJBQL定义一个主键的标准方法就非常有限。

youdao