DVMCOCA⁷⁹²⁹⁸ 基本例句 n.数字式电压表¹⁰⁰ The working principle of the indoor units refrigerating system was studied by the experimental research on DVM digital variable multi system's operational condition in summer. 通过对数码涡旋多联式空调系统的夏季运行状况的实验研究，获得了数码涡旋多联式空调系统中各台室内机制冷量随时间的变化规律； cnki