25. (A) Also (B) However (C) Even if (D) Perhaps

37. (A) When you are close to where the pebble fell, the waves are clearly in a circle, centered on where the pebble fell. (B) These are measured to ensure compliance with laws that govern acceptable sound emitted from a vehicle. (C) Engineers can use several analysis techniques to identify noise sources including near-field acoustic holography (NAH) and beamforming. (D) Beamforming presents several challenges including simultaneously measuring a large number of microphone sensors, transmitting and saving this large amount of acquired waveform data, and being able to quickly process large data sets.

25.
(A) Also
(B) However
(C) Even if
(D) Perhaps

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