某房屋，三角形屋架的山墙处抗风柱上端支承于屋架的上、下弦横向支撑架。如图是下弦横向支撑布置图。钢材为Q235

Which of the listed classes of fire is considered as one involving electrical equipment？

A.Class "A

B.Class "B"

C.Class "C"

D.Class "D"

The question was______the electrical equipment should be installed.

A．that

B．where

C．what

D．which

When fighting an electrical fire, you should first _____.

A.stop ventilation to the area

B.stop the vessel

C.secure electricity to the circuit

D.apply CO2 to the fire

A.class A

B.Class B

C.Class C

D.Class D

Before doing maintenance on electrical equipment, you should ____.

A.turn off power first

B.turn on power first

C.with a test pen in hand

D.tell C/E

A.solid materials such as wood or bales of fiber

B.flammable liquids

C.a piece of electrical equipment

D.combustible metallic solid

To prevent the spread of fire by convection you should _____.

A.remove combustibiles from direct exposure

B.cool the bulkhead around the fire

C.close all openings to the area

D.shut off electrical power

A.mechanical foam

B.chemical foam

C.carbon dioxide

D.soda acid