【单选题】

底漆层厚度必须介于0.05毫米到0.06毫米之间。

A、The coating thickness must be more than 0.05mm and less than 0.06mm.
B、The thickness of the second coating layer must be 0.05mm and 0.06mm.
C、The thickness of primer layer must be between 0.05 mm and 0.06 mm.