The uppermost layer of soil is called the:

a. A horizon c. E horizon
b. O horizon d. B horizon


B

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Weevil and billbug larvae do not have:

A) rasters B) mouthparts C) ?legs D) exoskeletons

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____ amplifiers are used for high gain at low frequencies or for amplification of a direct-current signal.

A. Operational B. Audio C. Direct-coupled D. RF

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Oxygen cylinders must be tested _____

a. annually b. every three years c. every five years d. every ten years

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An inductor with an inductive reactance of 48 W is connected in parallel with a 32 W resistor. What is the total impedance of this circuit?

A. 80 W B. 19.2 W C. 26.6 W D. 57.7 W

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