The internal friction of a lubricant caused by molecular attraction is called ____.
A. lubrication
B. viscosity
C. hydrocarbon
D. semisolid
Answer: B
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Programmable logic controllers operate by scanning the program that has been entered into memory.
Answer the following statement true (T) or false (F)
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El cemento para altas temperaturas _____.
a. no contiene cemento Portland b. contiene fibra mineral c. no fragua rápidamente d. Todos los anteriores.
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What is the step-down turns ratio of a transformer with 200 turns in the primary and 100 turns in the secondary?
a. 1:2 b. 2:1 c. 10:20 d. 20:10
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A thermostat terminal labeled W 2 controls _____
a. a heat pump's compressor b. a second stage of heat c. a heat pump's reversing valve d. the first stage of heat
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