题目内容

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。

A. 对
B. 错

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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

1.三眼插座在接线时，左边孔接（），右边孔接（），中间孔接（）。

正弦交流电路中正弦量的特征分别由（）、（）、（）来表示，它们通称为正弦量的三要素。

在我国，电的线电压为（）V，相电压为（）V。