新型汽车发动机瑞典一家汽车公司研制出一种具有机械操纵增压器和排气从动涡轮增压器双性能的载重汽车发动机。试验表明，这种发动机能降低废气污染。据称，该发动机在低转速时也能有效燃烧，并且在怠速时无排气烟度。在整个发动机转速范围内均能保持较低的废气排放量。这... New car engine A Swedish car company has developed a dual-performance truck engine with a mechanically-operated supercharger and an exhaust-driven turbocharger. Experiments show that this engine can reduce exhaust pollution. Allegedly, the engine is also effective in low-speed combustion, and no exhaust smoke at idle speed. Low exhaust emissions throughout the entire engine speed range. This...