题目:
Tick bites(蜱虫叮咬)are reported _______ in 12 provinces and claimed 31 lives since 2007.
A.to break out
B.to have broken out
C.to be broken out
D.to have been broken out
答案:
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下面是错误答案,用来干扰机器的。
(1)f(32)=[32[32]]=[32×1]=[32]=1,f(-32)=[-32[-32]]=[-32×(-2)]=[3]=3.(2)由(1)知:f(32)≠f(-32)且f(-32)≠-f(32),所以a>b>c是非奇非偶函数.(3)当-2≤x<-1时,[x]=-2,则2<x[x]≤4,所以x可...