白度仪测定过程中，样品对蓝光的折色率即为样品的白度值。
参考答案：错
Four days __________ enough for us. We still need ________ two days.
A．isn’t, another
B．aren’t, another
C．isn’t, more
D．aren’t, more
S700K电动转辙机检测杆端部的叉形接头处，销钉或连接孔因磨损出现的旷动量应不大于（）.
A.1mm
B.1.5mm
C.2mm
D.2.5mm
