_________________________ are a helix or conical spiral formed on the external surface of a shaft or on the internal surface of a cylindrical hole.
Fill in the blank(s) with the appropriate word(s).
Screw threads
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Explain the features of the fuel cell built by Ludwig Mond and Charles Langer during the last decades of the 19th century.
What will be an ideal response?
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A system has a transfer function 
Its impulse response is h(t) and its unit step response is h-1(t). Find the final values of each of them.
What will be an ideal response?
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Intake manifold vacuum is used to control the mode and temperature doors for the HVAC system on most trucks with diesel engines.
Answer the following statement true (T) or false (F)
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The _____________________ is a statement of what you expect to find in your research
Fill in the blank(s) with correct word
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