采区变电所 working section: 工作剖面; 开采区; 作业级; 荼剖面工作段试验段circular working section: 圆形试验段effect of working-section boundaries: 试验段筒壁影响flow calibration in working section: 风洞试验段的流场校准open jet working section: 开口试验段下载手机词典可随时随地查词查翻译