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Cambridge B1
Speaking Exam Sample
B1
Test Online
English Exam
Lab
Cambridge B1
Speaking Exam
English Exam
Level Test
Examen B1
Cambridge
Conversation
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Cambridge 2020
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Cambridge B1
Speaking Exercises
Ket Speaking Test 2020
B1
Preliminary Speaking Test
0:11
Original Video Credit: IG/goldone_ultrasonicwelding Dozens of fine copper strands are pressed together beneath a metal welding tool, forming a compact electrical connection in seconds. The process is called ultrasonic metal welding, and unlike conventional welding, it produces a solid bond without melting the copper. The machine applies pressure while transmitting rapid vibrations through the wire bundle, joining the individual strands into a tightly consolidated connection. Ultrasonic welding t
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