standard sample

... standard resistor,标准电阻器 standard sample,标准试件；参考试件 standard sea water,标准海水 ...

 reference test piece

... 参考试块 reference block 参考试件 reference test piece 相关显示 relevant indication ...

 reference piece

... reference phase ==> 参考相位,基准相位 reference piece ==> 参考试件 reference pilot ==> 参考导频 ...