optional test meaning in English
任选项目试验
选定试验
Examples
- Below is a brief description of standard testing performed on all valves as well as optional tests and other special requirements which may be performed at the customer ' s request
下面是对于所有阀门进行的标准检测程序的简单介绍，对于用户要求的备选检测程序和其它特殊检测程序，也相应进行简单介绍。