15. 下列敘述何者正確?
(A) cholinergic receptor及cholinergic innervation皆只存在於large airway
(B) cholinergic receptor只存在於large airway,但cholinergic innervation在large airway及peripheral airway皆存在
(C) cholinergic receptor在large airway及peripheral airway皆存在,但是cholinergic innervation只存在於large airway
(D) cholinergic receptor及cholinergic innervation在large airway及peripheral airway皆存在