成本减成法是寡头垄断市场上一种最常用的定价方法。（）
参考答案：错
属于肺血管疾病的是（）
A.肺血栓栓塞症
B.左心衰竭
C.急性呼吸窘迫综合征
D.多因性肺动脉高压
E.肺间质疾病
Since it was so difficult for American Indians to negotiate a peace treaty or declare war in their native language, they used a universal understood form of sign language.
