一个圆柱形玻璃容器的底面直径是10厘米.把一块铁块从这个容器的水中取出后,水面下降2厘米.求铁块体积

毛干(名词解释)

内蒙古细毛羊是以苏联美利奴羊，高加索羊，新疆细毛羊和德国美利奴羊与当地蒙古羊母羊，采用育成杂交方法育成。()

What did the Dodds do when they went away last summer？

A．They hired someone to stay in their home.

B．They left their pets with neighbors.

C．They rented their house to a student.

D．They asked their gardener to watch their house.

请帮忙给出正确答案和分析，谢谢！

羊性成熟(名词解释)

正常繁殖母羊的生理状态可分为哪几个阶段？