【单选题】We have seen how the mixture of air and fuel is delivered by the fuel system to the engine cylinder, _________ it is compressed, ignited, and burned.
【单选题】The selection of an oil depends () on the operating conditions, the design of the engine and the type of fuel to be burned.
【单选题】The piston then travels up through the cylinder and ( ) the burned fuel charge.
【单选题】以热空气作为采暖系统的热媒,我们称为()采暖系统。
【简答题】As fuel is burned in the engine, about one-third of the heat energy in the fuel is converted into power.