56. A common feature of action potentials is that they
(A) cause the membrane to hyperpolarize and then depolarize.
(B) can undergo temporal and spatial summation.
(C)are triggered by a depolarization that reaches threshold.
(D) move at the same speed along all axons.

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統計： A(5), B(5), C(52), D(2), E(0) #2911812