下列止喘药中.哪一种对心脏影响最轻() ["A.肾上腺素","B.鼻丙肾上腺素","C.麻黄碱","D.沙丁胺醇(舒喘灵)","E.氨茶碱"]
右侧斜裂约起自_______________,左侧斜裂约起自_________________。
角膜组织的发育来源于() ["A.神经外胚叶","B.脑神经嵴细胞","C.神经纤维层","D.中胚叶","E.表皮外胚叶"]
泪膜的生理作用是() ["A.润滑眼球表面","B.防止角结膜干燥","C.保持角膜光学特性","D.杀死病原菌","E.抵御眼球表面异物和微生物"]
皮肤吸收外界物质的途径有() ["A.角质层","B.毛囊皮脂腺","C.汗管口","D.毛发"]
观察分析循环系统病变时必须注意的方面,包括__________、__________、__________、__________________、________________、___________________。