【判断题】Environmental ethics are a key feature of environmental studies that establishes relationship between humans and the sun. It concerns formulating our moral obligations regarding the environment.
【单选题】In the compression stroke, one main difference between a diesel engine and a petrol engine is that ______. A the air is compressed in the sealed cylinder in the diesel engine
B.
the petrol engine has a comparatively very low compression ratio
C.
combustion occurs by spark ignition in the diesel engine