我国的陆地边界全长()。 ["2.2万千米","1.8万千米","2.8万千米","1.2万千米"]
轨道车“四不进”规定是什么?
关于网膜囊的正确说法是() ["A、前壁是大网膜和胃的后壁","B、后壁为覆盖在大、小肠表面的腹膜","C、不与腹膜腔相通","D、前壁是小网膜、胃后壁和胃结肠韧带","E、囊内有胰、左肾和左肾上腺等"]
小肝于二指肠韧带内含() ["A、肝总动脉 ","B、胆囊动脉 ","C、肝静脉 ","D、下腔静脉 ","E、肝门静脉"]
实验室标定KMnO4溶液时,常用的基准物质是( ) ["A、NA2S2O3","B、NA2B4O7•10H2O","C、NA2CO3","D、NA2C2O4"]
300条卡死制度中人身安全的内容是什么?