原文:Gasoline is a fuel whose vapor is readily explosive..译文:汽油是一种燃料,其油气 。

A . quantity of fuel to be received B . flash point of the fuel as it is received C . fuel temperature as it is received D . viscosity of the fuel being received

A . in time of B . in case of C . in terms of D . in honour of

A . broken down B . stuck C . oil leakage D . carbonized

A . permitted for drawing fuel samples B . permitted for draining fuel from lines C . permitted for bleeding air from lines D . prohibited

A . compression must be low for effective spark ignition B . compression must be low for required horsepower and torque generation C . compression must be low to prevent pre-ignition D . compression must be low to have effective pre-ignitio

A . which B . who C . what D . whose

A . cetane number B . volatility point C . viscosity index D . octane number

A . the exhaust will be clear B . fuel consumption will be low C . all the fuel will be burned at top dead center D . fuel consumption will be high

A . Fuel vapors gather in the lowest portions of the vessel B . Fuel vapors can only be ignited by an open flame C . Vent outlets should be located above the level of the carburetor air intake D . None of the above

A . in the engine compartment B . in the fuel tank space C . above or outside the hull D . at the most convenient locatio

A . effective B . efficient C . sufficient D . supplement

A . a spark plug B . injectors C . the heat of compression D . increasing jacket water temperature

A . intake valves B . carburetor C . exhaust ports D . injector nozzle

A . twice as expensive as B . twice as more expensive as C . as twice more expensive as D . as twice expensive a

A . keep ports，doors，windows，and hatches closed B . start engines immediately C . ventilate before starting engine D . None of the above

A . absolute value B . relative value C . constant value D . set value

A . water leakage B . steam leakage C . oil leakage D . air leakage

A . kerosene B . unleaded gasoline C . diesel oil D . liquefied ga

A . cross-head B . cylinder C . connecting rod D . spark plug

A . They are heavier than air and will settle in the lowest part of the vessel B . They are lighter than air and will settle in the highest part of the vessel C . They should be vented into the engine to improve combustion D . They should be vented into the wheelhouse

A . for B . to C . by D . a

A . permission B . emission C . omission D . Missio

The crisis has 【C2】______ questions about the large oil companies and windfall 【C3】______ . Critics of the oil industry charge that the major companies are getting richer because of the oil shortage. Shortage, of course, drives prices up. As oil prices rise, the critics say, the oil companies will make more money (windfall profits) without doing a thing to 【C4】______ the extra cash. "Windfall" profits are sudden unearned profits--profits made 【C5】______ luck, or some special turn of events. The word itself tells what "windfall" means--something blown down by the wind, such as trees, or fruit 【C6】______ from trees. But the word has taken on a special meaning. This meaning (getting something unearned) was first used in medieval England. This is 【C7】______ it started: at that time much of the land was in the hands of 【C8】______ barons. The rest of the people, commoners, lived and worked on their vast estates. They planted the seed, cared for the farm animals and harvested the crops. Not all the land, however, was used for farming. Every baron kept a large private forest for 【C9】______ deer and wild bear. When hungry, the people sometimes would kill the animals in the lord's forest for food. And there were times 【C10】______ they might cut down trees for fuel. So, strong laws were passed to protect the forests, and the animals. Violations were severely 【C11】______ . But there was one way people could get wood from the forest. If they found trees blown down by the wind ("windfall") they were free to take them for use as fuel in their homes. And that is the meaning that has come down to us--something good gotten by luck or 【C12】______ . The common people of old England, often hungry and cold, must often have prayed for a good strong wind. Critics today 【C13】______ that the oil industry has also been praying for something just like it --some political or military 【C14】______ that might produce a windfall--a rise in oil prices and profits. The oil companies deny that this is so. In Congress, critics of the oil companies have proposed a 【C15】______ on such profits. The debate on rising oil price will go on for some time, and most likely we will hear more and more about windfall profits. 【C1】______ A．threatened B．claimed C．explored D．narrowed

此题为多项选择题。