A. 直立内吹式泡沫管、斜置外吹式泡沫管和在喉管内的泡沫管三种 B. 斜置外吹式泡沫管和在喉管内的泡沫管两种 C. 直立内吹式泡沫管、平置外吹式泡沫管和在喉管内的泡沫管三种
A. exhaust and suction process B. suction and compression process C. combustion and exhaust process D. working and exhaust proce
A. 正确 B. 错误
A. 增大一倍 B. 减小一半 C. 不变