According to a USDA survey taken in 2009, no-till acres constitute about ____ percent of the country's farmland

a. 85 c. 45
b. 65 d. 35


D

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What type of output does an induction pulse generator used to read shaft or rotor speed produce?  

A. AC B. DC C. PWM D. constant frequency

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A(n) ____________________ is an electrochemical device that converts hydrogen and oxygen into electricity, water, and heat.

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

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The safety and health movement today is characterized by professionalization and integration.