甲基-α-D-吡喃葡萄糖苷和甲基-β-D-吡喃葡萄糖苷的比旋光度大小______，Rf值______，熔点______。
参考答案：不同；不同；不等。
When I try to understand ______ that prevents so many Americans from being as happy as one might expect,
it seemed to me that there are two causes. [ ]
A. why it does
B. what it does
C. what it is
D. why it is
以下属于检验标本送检过程中的伦理的是（）
A.骨髓标本收集时要防范发生麻醉意外
B.骨髓穿刺应最大程度减少对患者的物理创伤
C.涉及患者隐私的标本采集要在适宜的采集场所进行
D.对检验标本逐个进行认真登记和分类
E.标本采集要严格执行消毒措施，防止发生血液交叉感染
