单项选择题
Bleeding from a vein is（）.
A.dark red and has a steady flow B.bright red and slow C.bright red and spurting D.dark red and spurting
单项选择题 Basic emergency care for third degree electrical burn is to（）.
单项选择题 Atmospheres laden with coal dust or grain dust caused by loading these cargoes（）.
单项选择题 Antiseptics are used principally to（）.
