Most portable (手提式的) kinds operate for less than a minute, so they are useful only on small fires. The law requires(要求) ships, trains, buses and planes to carry extinguishers.Since fuel, oxygen and heat must be present in order for fire to exist, one or more of these things ...
8.To extinguish (熄灭) different kinds of fires,several types of fire extinguishers have been invented.They must be ready for immediate use when fire breaks out.Most portable (手提式的) kinds operate for less than a minute,so they are useful only on small fires.The law requires ships,trains...
17.To extinguish (熄灭) different kinds of fires,several types of fire extinguishers have been invented.They must be ready for immediate use when fire breaks out.Most portable (手提式的) kinds operate for less than a minute,so they are useful only on small fires.The law requires ships,...
This paper studied the effect of three kinds of heat treatment,including hot air,microwave and far-infrared,on the jujube red transforming and drying.The results showed that after the three kinds of heat treatment,the half-red jujube became red and the jujube total sugar and Vc content was le...
To extinguish (熄灭) different kinds of fires,several types of fire extinguishers have been invented.They must be ready for immediate use when fire breaks out.Most portable (手提式的) kinds operate for less than a minute,so they are useful only on small fires.The law requires ships,trains,...
There are multiple ways to trigger this sensation. What an orgasm feels like (and how to have one) varies from person to person. However, it's often described as an intense flush of heat and sensation centered in or radiating from the genital area. ...
Most portable(手提式的)kinds operate for less than a minute, so they are useful only on small fires . T he law requires ships, trains, buses and planesto carry extinguishers .Since fuel, oxygen(氧气)and heat must bepresent for fire to exist, one or more of thesethings must be removed...
aTo begin with, people do different kinds of jobs featuring different labor intensity and so the time needed to refresh their physical condition varies. For example, blue collar workers may work longer hours before they get tired physically, while white collar workers such as doctors and teachers...
The four key performance aspects of air-source heat pumps in a cold climate are high efficiency, low peak power demand, dependable defrosting, and long-term reliability. Some of these are interrelated, but a space-heating heat pump must excel in each area if it is to be attractive to custo...
To cover a small piece of burning wood with a basin(盆)in order to stop the fire is aft example of___. [ ] A. separating the fire B. reducing the heat C. removing the fuel D. cutting off the oxygen (3) In choosing how to put out a fire, we should first be clear about___...