When heat-treatable alloys are subjected to welding heat over a period of time, their strength is _____

a. reduced
b. increased
c. eliminated
d. not affected


a

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To create bread wrappers, the inner core (ply) is made of polypropylene with two outer layers of ____. ?

A. ?polyvinyl chloride B. ?polyester C. ?polyethylene D. ?polyamide

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This geometric tolerance allows a specified amount of surface variation from a flat plane.

a. straightness b. flatness c. profile d. parallelism

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We have lost ____ of our topsoil to erosion

A) one-third B) one-fourth C) all D) none

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When exposed to light, the resistance of a good cad cell should be:

A) 100,000 or higher. B) 30 to 1,000. C) 5,000 to 10,000. D) 1,000 to 5,000.

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