【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】以热空气作为采暖系统的热媒,我们称为()采暖系统。
【判断题】给排水科学与工程专业是以水的社会循环为研究对象。