The best way to compute an inventory turnover ratio is to use:（）

A. LIFO for COGS and FIFO for average inventory.  

B. FIFO for both COGS and average inventory.  

C. LIFO for both COGS and average inventory.

GB/T 21086 SM-MK-NT-BL-3.5标记幕墙特征为（）

A、单层

B、明框

C、外通风

D、玻璃

E、抗风压性能3.5kPa