硬膜外穿刺产生负压的主要原因()
A.硬膜外间隙原为负压
B.硬脊膜突然顶开
C.黄韧带突然顶开
D.穿刺针进入静脉
E.穿刺针进入蛛网膜下间隙
参考答案:B
— You won the first prize in the Physics competition.
— _________. I made several terrible mistakes.
A.I think so
B.You must be joking
C.You are welcome
D.It doesn’t matter
银行金融创新应以产品为中心,以盈利为导向。( )