高炉冶炼过程就是将矿石中的（）元素还原出来，变成液铁，流出炉外。

铅蓄电池的内阻包括（）、（）、（）和（）等。

简述神经系统的区分

Would you please supply ______ a complete set of catalogues for textile accessories so that we may make choice and work on them.

A．us
B．us with
C．us by
D．us for

Which of the following is most likely to be considered a characteristic of an oligopolistic industry（）

A. Few barriers to entry.

B. Few economies of scale.

C. A great deal of interdependence among firms.

一旦两船在公海上发生碰撞，可以应用的国家准据法是（）.

A.船旗国法律

B.法院地法律

C.双方协议的法律

D.以上三种均可，视具体情况确定