d.c. testing of cables

例句：

1. 1. Theengineer conducted a thorough DC testing of the cables before installation.
   工程师在安装前对电缆进行了彻底的直流电测试。
2. 2.During the testing process, the technician noticed an issue with the DC testing of the cables.
   在测试过程中，技术人员注意到了电缆的直流电测试存在问题。
3. 3.The company decided to replace the faulty DC testing of cables with new equipment.
   公司决定用新的设备替换损坏的直流电测试电缆。