For a deep vacuum to complete, the system pressure should hold:
A) Somewhere between 1,500 and 5,000 microns. B) Below 500 microns.
C) Above 500 microns. D) Somewhere between 5,001 and 10,000 microns.
B
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To put trunk duct or extended plenum sections together, the device used is called a drive clip.
Answer the following statement true (T) or false (F)
____________________ systems use a spark igniter (direct spark ignition) or a silicon carbide igniter (hot surface ignition) to light the main gas burner directly.
Fill in the blank(s) with the appropriate word(s).
A plant can be classified as a weed if it:
a. causes economic loss to a crop c. is detrimental to wildlife or ecosystems b. is harmful to humans and livestock d. All answers are correct.
The ___________________ transformer is used to make small adjustments in voltage, either up or down.
Fill in the blank(s) with the appropriate word(s).