第12题: [单项选择]The mother is told that her child is desperately ill—the chances of survival are slim, and the treatment is as dreadful as the disease. A. incurable B. fearful C. impossible D. troublesome 参考答案:B
第13题: [多项选择]湿式球磨机系统设计包括()。 A. 测量和控制制浆量; B. 制浆效果(粒径要求); C. 磨机的转速; D. 磨机出力。 参考答案:A, B, C