67.活化下列何種受體(receptor)能夠最有效地幫助支氣管擴張？
(A)α1 adrenergic receptor
(B)β2 adrenergic receptor
(C)M3 cholinergic receptor
(D)serotonin 5-HT3 receptor

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統計： A(0), B(1), C(0), D(0), E(0) #3976096