最有可能产生假性胎囊超声图像的是（）
A.卵巢浆液性囊腺瘤
B.输卵管积水
C.黄体囊肿
D.子宫肌瘤
E.子宫蜕膜管型
参考答案：E
a、b、c、d分别是一个菱形的四个顶点，∠abc＝120°.现将三个等量的正点电荷＋Q固定在a、b、c三个顶点上，将一个电荷量为＋Q的点电荷依次放在菱形中心O点和另一个顶点d点处，两点相比( )
A．＋Q在d点所受的电场力较大
B．＋Q在d点所具有的电势能较大
C．d点的电势低于O点的电势
D．d点的电场强度大于O点的电场强度
The politician has been warned that he would be getting into great trouble ____ stick to his standpoint.
A．were he to
B．he will
C．he was to
D．would he
