If a centrifugal pump were continually operated with the discharge valve closed, the （）. ["motor controller overload would open","pump would eventually overheat","relief valve would continuously cycle open","motor would overheat"]
简述会展项目可行性研究的内容。
控制爆破的微分原理是指总药量分散化和微量化。
二合一除油器（V-D03A/B）的安全阀是保证其工作压力不超过（）。
鱼怪病的病原是什么？
通信设备安装前应如何进行开箱检查？
