Small sailboats can easily turn over in

Which of the following statements regarding primary and secondary markets is FALSE()

A. Secondary market transactions occur between two investors and do not involve the firm that originally issued the security.

B. New issues of government securities can be sold on the primary market.

C. Prevailing market prices are determined by primary market transactions and are used in pricing new issues.

期货市场的两大巨头是(　　)。

A．伦敦国际金融期货交易所

B．芝加哥商业交易所

C．芝加哥期货交易所

D．法国期货交易所

中国与美国相比较，相似的地理特征有[ ]

A．主要河流的流向基本相同

B．经济发展水平东部发达，西部落后

C．年降水量由东南向西北递减

D．城市人口占总人口的比重在50%以上

（）最好的食物来源是奶制品。

A.锌

B.钙

C.铁

D.碘

随回火加热温度升高，钢的（）提高。

A.韧性；

B.综合机械性能；

C.硬度；

D.耐磨性。