【名词&注释】
系统性(systemic)、适用性(applicability)、质量体系(quality system)、咨询服务(service)、基本内容(basic content)、降低成本(reduce cost)、不相关(uncorrelated)、正常人血清(normal human serum)、质量管理体系文件(document of quality management)
[单选题]正常人血清(normal human serum)中钙和磷相互的浓度关系是(以mg/dl)( )
A. [Ca]·[P]=40~65
B. [Ca]·[P]=35~40
C. [Ca]·[P]=25~30
D. 二者不相关(uncorrelated)
E. [Ca]↑时[P]↑