脉压减小常见于()
A．甲亢
B．主动脉瓣狭窄
C．心力衰竭
D．心包积液
E．主动脉瓣关闭不全
参考答案：B, C, D
铸造金属全冠一般为
A．刃状边缘 B．凿状边缘 C．凹形边缘 D．肩台形边缘 E．带斜面凹形边缘
Susan has an excellent ability of ___________. [ ]
A. organizing activities
B. organize activity
C. organization activities
D. organizing activity
