高血压患者麻醉期间血压下降为原水平的多少，即视为低血压（）
A.10%
B.15%
C.20%
D.25%
E.30%
参考答案：D
He didn't put the things where they belonged, in ____ case everything was out of order. [ ]
A. that
B. what
C. whose
D. which
美国和香港证券市场采用的滚动交收周期分别为T+3和T+2。( )
