【单选题】Cell membranes
A.
contain relatively few protein molecules.
B.
contain a lot of carbohydrate molecules.
C.
are freely permeable to electrolytes but not to proteins.
D.
have variable protein and lipid contents depending on their location in the cell.
E.
have a stable composition throughout the life of the cell.
【简答题】作业习题:SLT10-350IF一个额定输出电流为DC 0.35A,额定功率为10W电源,耗散功率为65mW,正向电为0.02A的白光LED,可怎样配置?
【简答题】SLT10-350IF一个额定输出电流为DC 0.35A,额定功率为10W电源,耗散功率为65mW,正向电压为0.02A的白光LED,可配置多少个LED?
【判断题】轮辋表面区域损伤,若底层损伤深度≤1mm,与轮辋边缘距离≥5mm,则禁止维修。