“first appearance datum”的概念、定义、翻译、参考文献-科学参考

单词	first appearance datum
释义	first appearance datum Encyclopedia 理学生物地层带释 first appearance datum首现点某一化石分类单元在地层中出现的第一个层位（薄层）。是生物面的一种。又称首现基准面。
随便看	emissivity emissivity calibration emissivity measurement Emissivity Measurement by Measuring Eimissions emit emitron emittance emitted emitted color calibration emitted color standard emitter emitter barrier-layer capacitance emitter-base diode emitter coupled logic emitter-coupled logic emitter-coupled logic, ECL emitter direction-finding and location emitter dotting emitter-emitter coupled logic emitter function logic emitter junction emitter saturation of terahertz wave emitting area emitting atmosphere emitting dust mass

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