第22题: [单项选择]The term "pour point" is defined as the lowest temperature at which lubricating oils will flow (). A. rapidly B. by gravity C. through a standard orifice at a specified temperature D. at a rate of 60cc per second 参考答案:B
第23题: [多项选择]确定锅炉炉型的影响因素有() A. 锅炉热负荷的大小 B. 燃料的种类 C. 各参数要求 D. 基建投资多少 E. 厂家关系 参考答案:A, B, C, D