观察下列算式:21=2,22=4,23=8,24=16,25=32,26=64,27=128,…则230的尾数是 [ ]
A.2
B.4
C.6
D.8
答案:B
Could you say _________ about it, please ? I’d like to know more.
A.nothing else
B.anything else
C.something else
D.something other
枕骨大孔疝和小脑幕切迹疝主要鉴别点在于()
A.头痛剧烈
B.呕吐频繁
C.脉搏加快,血压升高
D.躁动不安
E.呼吸躁动在早期出现