താഴെ കൊടുത്തിരിക്കുന്നവയിൽ പാരമ്പര്യേതര ഊർജ്ജസ്രോതസ്സ് ഏത്? :
Aകൽക്കരി
Bസൗരോർജം
Cപെട്രോളിയം
Dഇവയൊന്നുമല്ല.
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