“文明交通行动”要求完善哪些道路安全及管理设施？
The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）. ["passing it through the expansion valve","condensing refrigerant in the system condenser","passing the gaseous refrigerant through the heat interchanger on the suction side of the compressor","maintaining a high pressure on the systems receiver"]
简述气泡病的症状和病理变化。
下列不需要使用操作任务单的是（）。 ["运行调整性操作","运行单项操作","程控操作","紧急事故处理时的相关操作"]
蕨类植物的生活史为（）。 ["孢子体占优势，配子体、孢子体均独立生活","孢子体占优势，配子体寄生于孢子体上","配子体占优势，孢子体寄生于配子体上","只有孢子体，无配子体"]
长途通信电缆线路施工作业程序包括哪些内容？
