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Which one of the following elements is used as a timekeeper in atomic clocks? परमाण्वीय घड़ियों में एक टाइमकीपर के रूप में प्रयुक्त होने वाला तत्व‚ निम्नलिखित में से कौन-सा है?

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Which one of the following elements is used as a timekeeper in atomic clocks? परमाण्वीय घड़ियों में एक टाइमकीपर के रूप में प्रयुक्त होने वाला तत्व‚ निम्नलिखित में से कौन-सा है?






 
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