Combined with practical works of coal-breaker house in one power plant the production of cracks on filler wall is analyzed, which probably caused by dynamic load.
Function and working principle of a gate watching dog of a guide circuit and a kind of a guide gate watching dog are presented for an intelligent vacuum circuit breaker in coal mine.
介绍了用于煤矿井下智能型真空磁力起动器中的先导电路看门狗的功能及工作原理和一种先导看门狗电路。
3
I don't know what a breaker boy is; but his occupation seems to be standing by a coal dump with a wan look and a dinner-pail to have his picture taken for magazine articles.