尸斑发展的过程分为(),()和()三期。
参考答案:坠积期;扩散期;浸润期
下列从左边到右边的变形,是因式分解的是( )
A.(3-x)(3+x)=9-x2
B.m3-n3=(m-n)(m2+mn+n2)
C.(y+1)(y-3)=-(3-y)(y+1)
D.4yz-2y2z+z=2y(2z-yz)+z
The man had expected to see all his friends when in hospital, but __came to see him.[ ]
A. anyone
B. no one
C. someone
D. none