有一只充满空气的集气瓶中,现要除去其中的氧气,又不增加其他气体成分,可选用的可燃物是( )
A.木炭
B.铁
C.磷
D.硫
答案:C
Organizations of all kinds now recognize the Internet as an effective means for ________ communication.[ ]
A. natural
B. global
C. formal
D. usual
急性硬膜下血肿最多见的出血来源为()
A.脑皮质破裂的小动脉
B.注入上矢状窦的桥静脉
C.注入蝶顶窦的大脑中静脉
D.注入横窦的Labbe静脉
E.大脑大静脉