平层感应器在电梯平层于每楼层面地坎时，上下平层感应器离磁板的中间位置应一致，其偏差最大不得大于（）mm。

A、1

B、2

C、3

D、4

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

A．presentation

B．application

C．qualification

D．appreciation