问答题Write out the components of the conduction system of heart.
多项选择题the narrows of the male urethra are: ().
A. at the internal urethral orifice B.at the external orifice of urethra C.at the membranous part D.at prostatic part E.at bulb of urethra
多项选择题he contents of carotid triangle include ().
A.common carotid a. and its branches B.internal jugular v. and its tributaries C.hypoglossal n. D.vagus nerve E.accessory nerve
多项选择题The structures can be seen in coronal section of kidney are ().
A.renal column B.renal pyramid C.renal cortex D.minor renal calices E.major renal calices
多项选择题Upper digestive tract consists of ().
A.duodenum B.esophagus C.oral cavity D.pharynx E.stomach