The earliest thermometers were based on: A) The expansion and ...

[Pineapplelove6]

The earliest thermometers were based on:
 
  A) The expansion and contraction of a spiral piece of metal.
  B) The position of the sun casting shadows.
  C) The expansion of a fluid trapped inside a glass tube.
  D) The expansion and contraction of air trapped in a tube above a column of liquid.

Question 2

Valves that use motors that move in tiny increments are:
 
  A) Cross charged expansion valves. B) Pulse modulated valves.
  C) Stepper motor valves. D) Electronic expansion valves.

[duke02]

Answer to Question 1

D

Answer to Question 2

C

[Pineapplelove6]

Excellent

[diana chang]

Gracias!