勒克斯
参考答案：
照度的国际单位。1流明的光通量均匀分布在1平方米面积上的照度，就是一勒克斯（1lx）。
— What a qualified husband he is!
— Definitely. Lots of people are touched by his ________ to his wife who has weak eyesight. [ ]
A. devotion
B. deed
C. satisfaction
D. service
血液在试管内发生凝固，这是外源性凝血过程。
