Which of the following one is best suitable for accurate measurement of distance?
ASteel tape
BInvar tape
CSteel band
DMetallic tape
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താഴെ കൊടുത്തിരിക്കുന്നവയിൽ പാരമ്പര്യേതര ഊർജ്ജസ്രോതസ്സ് ഏത്? :
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