Which of these methods is used to clear underbrush on tree farms?

a. Mechanical means c. Prescribed burning
b. Chemical means d. All answers are correct.


D

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What is the minimum fire resistance rating of the shaft enclosure for a fire -escape (means-of-egress) stair?

What will be an ideal response?

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All of the following are nitrogen carriers EXCEPT ____

a. anhydrous ammonia b. nitrate of soda c. urea d. granite meal e. ammonium sulfate

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To avoid falling, when working above a sheetrock ceiling technicians should:

A) Walk quickly whenever it is necessary to walk directly on the sheetrock. B) Walk slowly whenever it is necessary to walk directly on the sheetrock. C) Step only on ceiling joists. D) Step only on the sheetrock between the ceiling joists.

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Let x (t) = 10 cos (4?t).

(a) Is x (t) bandlimited? Explain your answer. If it is bandlimited what is its Nyquist rate?
(b) If we multiply x (t) by rect (t) to form y (t) is y (t) bandlimited? Explain your answer. If it is bandlimited what is its Nyquist rate?
(c) If we multiply x (t) by sinc (t) to form y (t) is y (t) bandlimited? Explain your answer. If it is bandlimited what is its Nyquist rate?
(d) If we multiply x (t) by
to form y (t) is y (t) bandlimited? Explain your answer. If it is bandlimited what is its Nyquist rate?

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