When there is a fire in a large electric motor, normally the very FIRST step is to _____.A

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

When a fire ____ at the National Exhibition in Lon

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

_____ there is smoke, there is fire.A: IfB; WhenC; Where

In the US there is a large gap between the legislative and ________branches ofgovern

阅读理解。 When the sun is up in Amsterdam the larges