The average sound level is 70 dBA, and the threshold of pain is reached at _____ dBA
a. 80 dBA
b. 100 dBA
c. 130 dBA
d. 150 dBA
c
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A ________ is a natural grouping of plants that have common characteristics in appearance, adaptation, and breeding behavior (i.e., can freely interbreed with each other).
Fill in the blank(s) with the appropriate word(s).
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What is the gear ratio of this gear set (small gear driving)?
A) 3:1
B) 1.5:1
C) 2:1
D) Cannot calculate
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The National Fuel Gas Code category of vent system used with a natural draft furnace is _____.
a. Category I b. Category II c. Category III d. Category IV
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A perfect vacuum is ____.
A. 14.7 psi B. 0 psig C. 30 in. Hg D. 27 in. Hg
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