第12题: [单项选择]二段炉出口CH4下降0.1%应提高()℃的反应温度。 A. 40 B. 100 C. 10 D. 30 参考答案:A
第13题: [单项选择]Many countries face some serious problems of land use, ()result from population growth and the demands of modem technological living. A. which most B. most of which C. most which D. of most which 参考答案:B 答案解析: