两个或两个以上界面之间的多个反射造成的假回声信号称（）。
A.折射
B.多重反射
C.排斥
D.散射
E.衍射
参考答案：B
决定输血治疗前，经治医师应向患者或家属说明输血可能引起的不良反应和可能传扩的疾病，并且要征得谁的同意
A．护士长
B．主治医师
C．输血科
D．患者或家属
E．其他医生
Which of the following statements is a key characteristic of the Global Investment Performance Standards (GIPS) The GIPS standards:（）
A. rely on the integrity of input data.
B. consist of required provisions for firms to follow to achieve best practice.
C. must be applied with the goal of achieving excellence in performance presentation.
