Due to the widespread ______ of this medical technology, more diseases can be discovered and treated at an early stage.

A．presentation

B．appreciation

C．qualification

D．application

吊在大厅天花板上的吊扇的总重力为G，静止时固定杆对吊环的拉力大小为F，当接通电源，让扇叶转动起来后，吊杆对吊环的拉力大小为F′，则有（）

A．F＝G，F′＝F

B．F＝G，F′>F

C．F＝G，F′<G

D．F′＝G，F′>F