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The Instrument That Emits a High-Frequency Sound Beam to Measure

Question 57

Multiple Choice

The instrument that emits a high-frequency sound beam to measure the depth of the ocean developed in the 1950s is the:

A) GLORIA.
B) precision-depth recorder (PDR) .
C) Seabeam.
D) SeaMARC.
E) SeaWif.

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