This fire extinguisher is to be used only in case of ___________.A. urgencyB. crisisC.

A carbon dioxide fire extinguisher has been partially discharged, and should be immediately _____.

The type of extinguisher which should be used for an electric fire is ______.A.carbon diox

This fire extinguisher is to be used only in case of ___________.A. urgencyB. crisisC.

If in doubt as to the true water level when a boiler is being oil－fired, you should _____.

What is the main idea of this passage？A．Fire－control is essential for human species to lea

The gunman Thornton was supposed to ______ this morning.A．be fired by company officials fo