题干
The fellow left without a word as if ________．
A：never to retur
B：never returning
C：he had never returned
D：he would never be returning
答案(点此获取答案解析）
A
A：never to retur
B：never returning
C：he had never returned
D：he would never be returning
Cd(OH)2 + 2Ni(OH)2
进行绿化和硬化．
，求P、Q两块绿地周围的硬化路面的宽．
和
，且
的距离与
的距离都相等，其余为硬化地面，如图②所示，这个设想是否成立？若成立，求出圆的半径；若不成立，说明理由．