函数单调减少区间是()
A.(-∞,0)
B.(0,1)
C.(1,e)
D.(e,+∞)
参考答案:B
解析:
因为
令y'<0 即
How very delightful ___ to suggest this!
A.it is you
B.it was for you
C.it is of you
D.it was you
有关头盆不均倾的发生,哪项是正确的
A.胎头以矢状缝嵌入骨盆入口前后径
B.骨盆入口前后径狭窄者
C.常见于均小骨盆
D.胎头以后顶骨先嵌入,矢状缝偏前称前不均倾
E.胎头于第一产程末未能完成内旋转动作