下列哪个器官的梗死灶为地图形()
A.小肠
B.脾
C.肾
D.心
E.肺
参考答案:D
Lincoln came from nothing, yet but he did ____ that changed the world.
A.something
B.anything
C.everything
D.nothing
(3)平衡电阻应取值()。
A.50kΩ
B.20kΩ
C.10kΩ
D.5kΩ