Land drainage is beneficial because ________
A) it increases the depth of root penetration in the soil
B) it increases the availability of iron and manganese in acid soils
C) it increases the alternate of expansion and contraction due to freezing and thawing of soils
D) it slows down the rate of soil warming in the spring
E) it increases the water-to-air ratio in the soil pores
A
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The rotor winding consists of many copper, or ____, bars fitted into slots in the rotor.
a. nickel b. aluminum c. zinc d. platinum
A centrifugal compressor uses ____ for capacity control.
A. guide vanes B. block vanes C. guide blocks D. control vanes
____________________ bacteria break down waste material in a lagoon
Fill in the blank(s) with correct word
Why is a vacuum line attached to a fuel-pressure regulator on many port-fuel-injected engines?
A) To create an equal pressure drop across the injectors B) To lower the fuel pressure under heavy engine load conditions to help improve fuel economy C) To draw fuel back into the intake manifold through the vacuum hose D) To raise the fuel pressure at idle