通常用的纱线原料代号是：C为棉、T为涤纶、A为（）、R为粘纤。
A.富纤
B.维纶
C.棉纤
D.晴纶
参考答案：D
股票发行费不可在股票发行溢价中扣除。（）
Suppose the price of computers increases from $1000 to $1200. Assuming the original quantity demanded for computers was 50 million units, and the new quantity demanded is 45 million computers, what is the price elasticity of demand, and is the demand for computers elastic or inelastic（）
A. 0.58,
B. -0.58,
C. 1.73,
