一道多项选择题有A、B、C、D、E五个备选项,要求从中选出2个或2个以上的选项作为唯一正确的选项。如果全凭猜测,猜对这道题的概率是()。
A.A
B.B
C.C
D.D
参考答案:C
— I don't know_____ makes her different from others.
— Honesty, I think. [ ]
A. how is it that
B. how it is that
C. what is it that
D. what it is that
如果总增益降低,那么()
A.施加于患者的能量降低
B.所有回声的强度都降低相同水平
C.探头频率降低
D.仅远场的回声亮度降低
E.分辨力降低