discharge unit短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 出监单元 Briefly introduces Present heating manners and their existent problems in domestic large workshops, as well as the application effectiveness of downward discharge unit heater. 简要介绍目前国内高大厂房常用采暖方式和存在问题，以及采用下送射流式暖风机的效果。 cnki