单项选择题

与颅底内、外直接沟通的结构是 A.
腭大孔 B.
棘孔 C.
切牙孔 D.
外耳门 E.
下颌孔

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During which phase of the ventricular action potential the membrane potential is closest to the K+ equilibrium potential? ()

A．Phase 0
B．Phase 1
C．Phase 2
D．Phase 3
E．Phase 4