题目内容
起动后点火提前角由基本点火提前角和修正系数组成。
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发动机设计的最佳基本点火提前角的数据存储在发动机电脑的存储器中。
暖机过程中,随着冷却液温度的升高,点火提前角应逐渐增大。
汽油发动机获得最大功率和最佳燃油经济性的有效方法之一是增大点火提前角,但是点火提前角过大又会引起发动机爆震。
Complete the company profile of a French energy company, by choosing the correct word A-D below to fill each gap.EDF is one of the largest electricity companies in the world with a (0) turnover of 59 billion Euros in 2006. Its 1 ______ are in Paris, and it is the dominant player in France, with over 80% of the market. Its largest2_____, 100% owned by EDF is EDF-Energy which supplies over five million customers in the UK.The company has three main 3 _______ electricity production, of which 70% comes from nuclear power 4______; distribution; and retail or supply. The first two are very technical activities. The third, retail, is more customer focused. Nowadays, most customer contact is handled by 5_____ centres, where operators manage customer enquiries online or over the telephone. Electricity is an unusual product. It cannot be stored in a 6_____ like other goods. What you produce has to be consumed immediately. So, supply and demand have to be balanced exactly on a day by day, or hour by hour basis.0 A sales B turnover C income D figure
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