某汽油机在3000r/min时测得其转矩为105N•m,在该工况下燃烧50ml的汽油的时间是14.5秒。计算该工况点的有效功率Pe(kW),每小时耗油量B(kg/h),比油耗be(g/kW•h)。(汽油的密度为0.74g/ml)
Books are a ______ provider of knowledge and pleasure and some types of books sould be in every home, such as a good dictionary, a good encyclopedia and so on.
Don’t ______ that all these who get good grades in the entrance examination will prove to be most successful.
--Li Yuchun, the No. 1 Supergirl, is coming to our city to sing tonight.--Wow! _____ our evening classes could be canceled.
—Are you going to visit Mr. Black or Green tomorrow?—_______,because they won't be free until the day after tomorrow.
--I will be away from home for some time. Could you do me a favor and look after my baby?--Not at all. _______.