double power meaning in English

也有大母牛

Double power earth electric magnetic depth measuring and application
双源大地电磁测深及其应用
Application of double power resources automatic transforming switch equipment
双电源自动切换装置的应用
Research on automatic intelligent switching - over double power supply system
双电源智能自动切换系统的研究
Test and application of double power automatic switching device for auxiliary fan
局部通风机双电源自动切换装置的试验与应用
Application of auto - converted self - starter in double - inlet fans with double power supply
双风机双电源自动切换起动器在丰矿的应用

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