Which of the following are symptoms of a fault in the EGR system?
A) Rough idle and stalling B) Excessive NOx emissions
C) Detonation during acceleration or cruise D) All of these
D
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Después de siete días de curado normal, el concreto ha alcan- zado aproximadamente el _____ por ciento de su resistencia.
a. 50 b. 70 c. 85 d. 100
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Which of these values indicates a neutral pH?
a. 5 c. 7 b. 6 d. 8
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Winter temperatures between ____°F and 77°F with RH levels ranging between 22% and 70% are generally considered to be comfortable for most people.
A. 58 B. 62 C. 65 D. 68
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When using explosives, the specific precautions to be taken to prevent accidental discharges: