While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to (). ["change the expansion valve adjustment","readjust the water regulating valve to increase the flow of water","purge air from the condenser","clean the waterside of the condenser"]
如何来理解植物体内有机物分配的“库”与“源”的关系?
低压配电盘的火灾原因是什么?怎样预防?
电容器爆炸起火的原因是什么?怎样预防?
Excel把一个文件称为一个()。 ["工作簿","工作表","工作区","图表"]
焊完后焊缝应立即去除()、飞溅物,清理干净焊缝表面,然后进行焊缝外观检查。