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PDC
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【计】 永久数据呼叫
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详细解释：
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以下为句子列表：
英文: A new method of absolute calibration of photodetector sensitivity based on spontaneous parametric down-conversion(SPDC) biphoton field is described.The process of SPDC is studied theoretically.The single photon detection probability and two-photon coincid
中文: 讨论了一种基于自发参量下转换双光子场绝对校准光电探测器灵敏度的新方法，着重推导了对自发参量下转换过程中产生的单光子的探测概率和双光子的符合速率，从而阐明了绝对测量光电探测器量子效率的原理.基于这一方法对光子计数型光电倍增管的响应灵敏度进行了测量，并将实验结果与常规方法测得的结果进行了比较.
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英文: Its PDC is mainly used in the industries of oil drilling, geographical exploration, oil field exploitation and machinery processing etc.
中文: 主导产品金刚石复合片，广泛应用于石油钻井、地质勘探、煤田开采、机械加工等行业。
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英文: Since its inception, PDC has expanded at a rapid pace and is now a key department for delivery of banking systems within the HSBC Group.
中文: 自成立以来，软件开发中心高速发展，现已成为汇丰集团银行系统的关键部门。
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英文: The objective of three usually used extract methods with DDTC, potassium and APDC were investigated contrast.
中文: 摘要本文选用常用的三种DDTC、碘化钾和APDC萃取分离方法进行比较研究。
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英文: This is jet bit and that is a PDC bit.
中文: 这是喷射式钻头，那是人造聚晶金钢石钻头。
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