low vacuum短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 低度真空,低真空 Current profile extrusion practice typically involves dry calibration tables, which can be30 ft or more long, in front of a water immersion tank with form guides under low vacuum. 目前，型材挤出实践包括干标定台，它有30多英尺长，位于浸渍水箱的前部，结构导轨处于负压。 plasj06