单项选择题
Defective atomizer in a diesel engine will lead to（）.
A.smoky exhaust B.starting failure C.overload D.over speed
单项选择题 A supercharged engine differs from an un-supercharged engine it operates at an increases pressure（）.
单项选择题 Cooling makes the engine metals their mechanical properties（）.
单项选择题 Gas turbines differ from steam turbines in that （）.
