The equipment used to measure the depth of water by measuring the time it takes for a pulse of sound to travel from source to sea bottom and return:
AEcogram
BEcho sounder
CDistomat
DSonogram
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പരിക്രമീകൃത ബോധനം (Programmed Instruction) രൂപപ്പെടുത്തിയത് ഏതു പഠന സിദ്ധാന്തത്തെ അടിസ്ഥാനപ്പെടുത്തിയാണ് ?
Mouthpieces are used to measure