CFCs can exist in the atmosphere for more than ____ years.

A. 20
B. 30
C. 50
D. 60


Answer: C

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Describe how the processor files, which are created when a PLC program is written, are classified.

What will be an ideal response?

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The ____________________ is a device that creates a magnetic field when energized and causes some action to an electric component such as a relay or valve.

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

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The messages encoded in the DNA are transferred to the rest of the cell by means of a messenger substance known as:

a. GNA c. RNA b. YNA d. BNA

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