What two fasteners are used with fiberglass duct?
A. "S" fasteners (clips) and drive clips (cleats)
B. staples and tape
C. self-tapping screws and draw bands
D. tabs and adhesives
Answer: B
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________ and ________ were the first scientists to publish the structure of a DNA molecule in 1953.
Fill in the blank(s) with the appropriate word(s).
The use of a solvent-based mastic may be restricted during application because _____.
a. the system must be hot b. it is flammable c. it can dissolve most types of board insulation d. the system must be cold
The primary method of varying the speed on a DC shunt motor is to adjust the voltage and current on the field winding or the _____.
a. rheostat b. armature c. controller d. stator key
A substance can be considered __________ when a small quantity will cause injurious effects in the body of an average adult human.
Fill in the blank(s) with the appropriate word(s).