Where is a "Salamander" used?
A) They are used to pre-heat the return air in air source heat pumps
B) They are specifically designed to heat aquatic biospheres containing amphibians
C) They are most often used in bedrooms to supplement central heating systems on unusually cold nights
D) They are often used during building construction to supply temporary heat
D
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8. The greatest advantage of using direct current motors is their variable ____________________ characteristic.
Fill in the blank(s) with the appropriate word(s).
What breeding method has the advantage of being able to select from a wide range of superior bulls?
What will be an ideal response?
When a pump or motor is variable-displacement it will have a/an ______________ drawn through it.
Fill in the blank(s) with the appropriate word(s).
If a tank circuit is operating above resonance, it is ________ in nature
A) capacitive B) resistive C) inductive D) positive