Which one of the following International waterways is operated through lock-system ?

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Q: 67 (RAS/2013)

Which one of the following International waterways is operated through lock-system ?

question_subject: 

Geography

question_exam: 

RAS

stats: 

0,0,85,48,9,5,23

keywords: 

{'international waterways': [0, 0, 0, 1], 'suez canal': [2, 1, 0, 3], 'panama canal': [2, 0, 1, 0], 'rhine river': [1, 0, 0, 1], 'denube river': [0, 0, 0, 1], 'lock': [0, 0, 0, 1]}