下列哪项不是胸痹的病因 ["寒邪内侵","先天遗传","饮食不当","情志失调","年老体虚"]
造血干细胞(hematopietic stem cell)
枕外隆凸的内面是() ["A．直窦","B．窦汇","C．上矢状窦","D．下矢状窦","E．乙状窦"]
干细胞(stem)
对颈外动脉正确的说法是() ["A．颞浅动脉发出面横动脉","B．行于下颌后静脉的前外侧","C．至下颔头上方分为上颌动脉和颞浅动脉","D．上颌动脉入颞窝","E．在下颌后窝内由浅面穿入腮腺"]
不稳定细胞(labile cell)
