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问题 问答题 简答题

化油器式汽油机燃料供给系起什么作用？

答案

参考答案：

根据发动机各种不同的工况要求，将清净的汽油和空气配制成各种适当浓度的混合气，按不同的数量供入气缸，并在点燃作功后将废气排入大气。

填空题

将每套装置的交流电流回路、交流电压回路和直流回路等分开表示独立绘制，同时将仪器、继电器等的线圈、接点分别绘制在所属的回路中，我们习惯上称这种简图为（）原理图。
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单项选择题

In the past most airline companies minimized aircraft weight to minimize fuel costs. The safest airline seats were heavy, and airlines equipped their planes with few of these seats. This year the seat that has sold best to airlines has been the safest one—a clear indication that airlines are assigning a higher priority to safe seating than to minimizing fuel costs.
Which of the following, if true, most seriously weakens the argument above

A．Last year’s best-selling airline seat was not the safest airline seat on the market.

B．No airline company has announced that it would be making safe seating a higher priority this year.

C．The price of fuel was higher this year than it had been in most of the years when the safest airline seats sold poorly.

D．Because of increases in the cost of materials, all airline seats were more expensive to manufacture this year than in any previous year.

E．(E) Because of technological innovations, the safest airline seat on the market this year weighed less than most other airline seats on the market.
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