The substance believed to caUse depletion of stratospheric ozone is

a. SO2
b. NO2
c. PCB
d. CFC
e. DDT


d

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As a rule, a bill of materials is shown in a(n) ____________________ space on the drawing.

Fill in the blank(s) with the appropriate word(s).

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One definition of ____________________ is that two entities take up the same space.

Fill in the blank(s) with the appropriate word(s).

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How long does it take a typical tractor-trailer to clear a double railroad track?

A. 15 seconds B. 7 seconds C. 1 minute D. 30 seconds

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Which former U.S. President was an FFA member?

A) Herbert Hoover B) Bill Clinton C) Jimmy Carter D) George W Bush

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