Phosphorus availability in acid soils is constrained by the presence of significant quantities of reactive ________
A) boron B) sulfur C) iron D) calcium E) magnesium
C
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The Ku Klux Klan could best be described as
A. an open political organization seeking to revive the Confederacy. B. the military arm of the southern Democratic party. C. a civic reform and service organization. D. a movement for openly protesting northern oppression. E. a secret terrorist organization seeking to subjugate and terrorize blacks in the South through violent means.
The ____ is the cost of the element divided by its quantity.
A. piece rate B. single-rate C. variable rate D. unit rate
The difference between vent sizing for natural-draft appliances and fan-assisted appliances is that:
A) Vents for fan-assisted appliances are always the same size as the connector on the furnace. B) Columns for fan-assisted appliances list both a minimum and a maximum appliance capacity for each vent size. C) Columns for fan-assisted appliances list sizes for both vertical and horizontal installation. D) Vents for fan-assisted appliances are typically larger in diameter for the same BTU capacity.
Centrifugal chillers range in size from ____ tons.
A. 10 to 50 B. 10 to 80 C. 50 to 500 D. 100 to 10,000