烧伤达表皮层,按分度法属于()。
A.Ⅰ°
B.浅Ⅱ°
C.深Ⅱ°
D.Ⅲ°
E.不在分度内
参考答案:A
解析:浅Ⅱ°是真皮浅层,真皮深层是深Ⅱ°,全程以下为Ⅲ°。
设集合A={2011,2012},则满足A∪B={2011,2012,2013}的集合B的个数为( )
A.1
B.3
C.4
D.8
The work is too hard for him. He__________ finish it on time.
A.can't
B.mustn't
C.shouldn't
D.needn't