General Knowledge MCQs – Certification Test 806
MCQ 806: Screw was invented in 3rd century B.C by:
The App: Cotton Gin MCQs App to Study Cotton Gin Notes, General Knowledge MCQs App, and Distributed Computing MCQs App for digital knowledge building.
The "Cotton Gin" App: Free General Knowledge Learning App Download (iOS & Android) for digital awareness training. Download Play Store & App Store Learning Apps with all functionalities to enhance learning access.