处理额窦前壁线型骨折宜采用（）

A.清创缝合、收敛鼻粘膜，保持鼻额管通畅

B.眶上缘切口，骨折固定

C.去除额窦前壁

D.去除额窦腔粘膜，脂肪填充

E.去除额窦坏死组织

The standardization of futures contracts promotes liquidity because:()

A. all the participants in the market know exactly what is being offered for sale, and they know the terms of the transactions. 

B. it guarantees that all of the traders in the futures market will honor their obligations and that futures contracts trade in a smoothly functioning market. 

C. it provides a safeguard whereby traders are required to realize any losses in cash on the day they occur.