12.心內膜(endocardium)主要是由下列何種上皮組成？
(A)單層扁平上皮(simple squamous epithelium)
(B)單層立方上皮(simple cuboidal epithelium)
(C)單層柱狀上皮(simple columnar epithelium)
(D)變形上皮(transitional epithelium)

答案：(A) 單層扁平上皮 (simp...