pydCOCA⁹¹⁰⁴⁶BNC¹⁷³⁹⁹⁵⁺² 基本例句 abbr.嘧啶核苷pyrimidine nucleoside Objective To evaluate the relationship between the urinary excretion of pyridinoline PYD and longitudinal changes of forearm bone mineral density in the elderly. 目的了解老年人 PYD的检测值以及与前臂骨密度动态变化之间的关系。 cnki