cylinder ratiostroke bore ratiostroke diameter ratiostrokebore ratiosurface to volume ratio行程: route or distance of travel; ...缸径: bore; cylinder diameter比: 2冲程缸径比: stroke bore ratio; strokebore ratio; stroke-boreratio气缸容积比行程缸径比: cylinder ratio下载手机词典可随时随地查词查翻译