In April last year, thousands of holiday-makers in Europe remained ___________ abroad  due    to the volcanic ash cloud.                                                                                  

A．sticking

B．stuck

C．to be stuck

D．to have stuck

以下哪项能用于考察随机变动因素对精密度的影响（）

A.重复性

B.中间精密度

C.重现性

D.专属性

E.检测限