21 身體內主要存在於肝臟、腎上腺及造血器官的微血管類型屬於: (A)連續型微血管(continuous capillary) (B)竇狀型微血管(sinusoidal capillary) (C)障壁型微血管(barrier capillary) (D)開窗型微血管(fenestrated capillary)