多个边缘清楚的结节或肿块,可见于哪种情况()
A.转移性肿瘤
B.细支气管肺泡癌
C.原发肺癌血源性肺扩散
D.大细胞癌
E.多发原发肺癌
参考答案:A, B, C, E
Teachers recommend parents ____ their children under 12 to ride bicycles to school for safety.[ ]
A. not allow
B. do not allow
C. mustn't allow
D. can't allow
和重选法相比,浮选回收的矿物粒度下限()。
A、更粗;
B、更细;
C、相近;
D、更宽