单选题After using a Halon extinguisher，it should be（）.A put back in service if more than 50% of the charge remainsB repaintedC discardedD recharged

Inspection of a Halon extinguisher involves checking the hose，handle，nozzle，and ______.

A.sight glass

B.weighing the extinguisher

C.service technicians report

D.last date it was charged

A carbon dioxide fire extinguisher should be recharged ______.

A.at least annually

B.whenever it is below its required weight

C.only if the extinguisher has been used

D.before every safety inspection

What type of extinguisher should be used for an electric fire? ________

A.CO2

B.Form

C.Water

D.Water and Form

Which statement is TRUE concerning insulating flanges ________．

A.They should be inspected and tested periodically to ensure that the insulation is clean and in good condition

B.Switching off a cathodic protection system may be substituted for using an insulating flange

C.The measured resistance value after installation should be less than 1，000 ohms

D.After the insulating flange is installed，hot work may be performed on deck

After using a CO2 portable extinguisher, it should be ______.

A.put back in service if some CO2 remains

B.hydrostatically tested

C.retagged

D.Recharged

Upon the completion of required tests, a ____ should be placed on each extinguisher, showing the date and the person who completed the tests.

A.cap

B.disc

C.tag

D.cover