发动机润滑系的作用是什么?
参考答案:
发动机润滑系统的作用是将清洁的润滑油供给发动机各摩擦表面并将各摩擦表面流出的润滑油加以冷却和滤清,循环使用。
Air France SA said Monday that its second-quarter net profit fell 35 percent to €57 million ($57.4 million), but sales were steady and operating profit surged.Earnings before interest and tax, a measure of operating income, gained 86 percent to €141 million as fuel costs fell and cargo traffic rose. Air France has been hurt less than rivals such as British Airways PLC and Lufthansa AG by the slowdown on North Atlantic routes following the war on Iraq in 2003 because it has fewer flights in that market.Net income fell as the airline paid deferred taxes that came due. Sales rose 0.9 percent to €3.2 billion. The carrier lost about €80 million in revenue because of a four-day strike by pilots in September. An accord was reached tying future pay increases to inflation. The carrier said that first-half fuel costs fell 15 percent to €680 million. Cargo traffic rose 11 percent in the second quarter, while passenger traffic rose 1.1 percent. The airline’’s shares gained 87 cents, or 7.7 percent, to close at €12.11.Separately, Air France and Alitalia SpA agreed to buy 2 percent stakes in each other as Europe’’s second- and sixth-largest airlines deepen their partnership.
Which of the following is not a cause for Air France’s earnings to rise before interest and tax
A.The drop in fuel cost.
B.The rise in cargo traffic.
C.The rise in passenger traffic.
D.Its partnership with Alitalia SpA.
下列哪一项不是腭护板的功能()
A.减轻或消除颌骨偏斜
B.改善语音
C.有利于进食和吞咽
D.盖住伤口,防止伤口感染
E.减轻手术对患者的心理冲击