关于钢铁工业的叙述,正确的是[ ]
A.日益小型化、分散化
B.占地面积小,生产过程简单
C.是在第二次技术革命后出现的
D.区位指向的变化过程是:煤炭-铁矿-港口
答案:D
Under identical load conditions,nylon,when compared with natural fiber line,will stretch().
A.less and have less strength
B.more and have less strength
C.more and have greater strength
D.less and have greater strength
下列哪种肿瘤以局部破坏为主,很少发生转移()
A.基底细胞癌
B.腺癌
C.黑色素瘤
D.鳞癌
E. * * 状腺癌