When lighting off an auxiliary boiler, which of the problems listed could cause the burner

When there is a flame failure in an automatically fired auxiliary boiler, the _____.

When does auxiliary burner of incinerator put into operation？ Istart incinerator when it i

Prior to lighting off a cold automatically fired auxiliary boiler, yon should _____.

Please turn the light off before leaving the room.（英译中)

When________ that it was getting late, I put off the light and went to bed.A、findB、fi

The correct procedure for giving an auxiliary boiler a bottom blow, is to begin .A.when th