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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____________________ 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).
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)