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Which of the following gases represents the greatest threat to personnel safety in an engine room w...

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They were formed in 1984.  They are at the top of two active volcanoes.  They are not like most other crater lakes.  Water in them turns over regularly.  
Burning too much coal and oil produces lots of greenhouse gases.  It has become warmer on the earth now than in the past.  Gases put into the atmosphere now will affect the earth years later.  The temperature in a greenhouse is as high as that in the atmosphere.  
in which  on which  by which  from which  
the way in which gases are used for keeping plants warm  a natural course which is to some degree helpful to us  the way" greenhouse gases trap heat on the earth  the whole course in which greenhouse gases prevent heat  
Natural convection only  Forced convection only  Both natural convection and forced convection  None  
what do scientists call    which it scientists call    scientists call it    what scientists call  
great harm would be done to mankind  the sea level would go by 10 centimetres  all the land in the world would be flooded  crops would be unable to grow on the earth  
They were formed in 1984.  They are at the top of two active volcanoes.  They are not like most other crater lakes.  Water in them turns over regularly.  
Burning too much coal and oil produces lots of greenhouse gases.  It has become warmer on the earth now than in the past.  Gases put into the atmosphere now will affect the earth years later.  The temperature in a greenhouse is as high as that in the atmosphere.  
The liquid receiver functions to collect and remove non-condensable gases  A thermostatic expansion valve is used to control refrigerated space temperature  Refrigerant temperature in an evaporator is directly related to refrigerant pressure  Dehydrators must be used continuously in a refrigeration system  
Constant pressure  Pulse  constant velocity  Axial flow  
They were formed in 1984.  They are at the top of two active volcanoes.  They are not like most other crater lakes.  Water in them turns over regularly.  
approved by the Coast Guard  high carbon steel  fixed with a ferrous cover  nonsparking  
no plants would grow on our planet  earth would be thirty degrees colder  man could not live on the earth  all of the above answers are correct  
the way in which gases are used for keeping plants warm  a natural course which is to some degree helpful to us  the way" greenhouse gases trap heat on the earth  the whole course in which greenhouse gases prevent heat  
As pressure decreases, volume increases  As volume increases, pressure increases  As volume decreases, pressure decreases  AS pressure increases, volume increases  
Combustion gases flow through the tubes  Flames impinge on the tubes  Combustion occurs in the tubes  Water flows through the tubes  

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