Which of the following letters stands for one of the four bases present in DNA?

A. W
B. T
C. R
D. E


Answer: B

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If valves are set loose, which of the following will result?

A. advanced valve timing B. hotter valve operating temperatures C. noisier valve operation D. retarded valve timing

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____________________ is the rate of doing work or using energy.

a. electric current b. voltage c. resistance d. power

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In a direct digital control system the primary controller is the

A) bleed type thermostat. B) voltage amplifier. C) HVACR computer. D) Wheatstone bridge.

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A Grade 8 bolt has _______ Radial Lines on its heaD

A. No B. 2 C. 5 D. 6

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