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【判断题】
在三个切削分力中，磨外圆时切削力Fc最大，时背向力Fp最大。A.
正确
B.
错误
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举一反三
【单选题】According to the passage, what is NOT an alternative energy source? ______
A.
Fuel cell.
B.
Nuclear power.
C.
Petrol.
D.
Sun energy.
【简答题】Hydrogen-powered fuel-cell vehicles that need no oil and emit no ______ will be developed by the Department of Energy and automakers Ford, General Motors and DaimlerChrysler.
【简答题】Fuel cell
【简答题】Fuel cell stack
【单选题】In fuel cell vehicles, _____________converts hydrogen gas and oxygen into electricity to power the electric motor
A.
power control unit
B.
fuel cell stack
C.
high-output baterry
D.
electric motor
【单选题】Summary of the New Models Two alternative designs for a fuel cell powered car are presented. Car A, which uses hydrogen fuel, is a sedan designed for the executive market. It provides extra luxury for...
A.
The safety features of Car A and B are of much resemblance.
B.
They both have a desirable range and speed for long journeys.
C.
Both share the features of low emission and friendliness to the environment.
D.
Both cars are of high efficiency for short travels.
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