16.各種消化道平滑肌收縮模式中，那一種是大腸特有的平滑肌收縮？
(A)peristaltic wave
(B)segmentation contraction
(C)tonic contraction
(D)mass action contraction

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統計： A(8), B(25), C(32), D(242), E(0) #1154402