Which hydraulic structure is designed to raise or lower boats between water levels in a canal or river?
کون سا ہائیڈرولک ڈھانچہ کسی نہر یا دریا میں پانی کی سطح کے درمیان کشتیوں کو اونچا یا کم کرنے کے لیے ڈیزائن کیا گیا ہے؟
Answer: Lock
Explanation
A lock is a device used for raising and lowering boats,
ships and other watercraft between stretches of water of different levels on river and canal waterways.
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