Natural gas is: A) Heavier than air. B) Lighter than air. C) ...

[ashley]

Natural gas is:
 
  A) Heavier than air.
  B) Lighter than air.
  C) Either lighter or heavier than air depending on the characteristics of the local gas.
  D) About the same density as air.

Question 2

Most communicating systems are wired with four wires. They are:
 
  A) One wire for power, one for cooling, one for heating, and one for fan.
  B) Two wires for 24 V power and two for communication.
  C) Communication lines 1, 2, 3, and 4.
  D) Power lines 1, 2, 3, and 4.

[Jadwiga9]

Answer to Question 1

B

Answer to Question 2

B

[ashley]

Gracias!

[xoxo123]

Excellent