仓储实行分区分类保管的前提条件是（）。
A、商品价值一致
B、养护措施一致
C、堆垛方式一致
D、消防方法一致
E、商品性能一致
参考答案：B, D, E
An analyst is doing research about survivorship bias and its impact on measurement ratios. With a failure to comply with performance presentation standard, hedge fund databases and indexes, which are most likely to overstate:（）
A. Sharpe ratios.
B. standard deviation of retums.
C. correlations with returns from common stocks.
碘酊作为口腔内消毒剂的浓度应是
A．0.5%
B．1.0%
C．1.5%
D．2.0%
E．1.5%
