Which one of the following elements is essential for the construction of nuclear reactors ?

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Q: 104 (IAS/1998)
Which one of the following elements is essential for the construction of nuclear reactors ?
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question_subject: 

Science

question_exam: 

IAS

stats: 

0,54,54,24,18,54,12

keywords: 

{'nuclear reactors': [0, 1, 1, 3], 'elements': [0, 0, 2, 5], 'zirconium': [0, 2, 1, 0], 'cobalt': [0, 0, 0, 1], 'tungsten': [0, 0, 0, 2], 'nickel': [1, 0, 0, 0], 'construction': [2, 2, 4, 14]}