What Is It? #7
A. A laser source from a CD-ROM drive B. A tiny electric switch from the button of a digital watch C. The electron source for a scanning electron microscope D. A read/write head from a hard drive
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What Is It? #7
A. A laser source from a CD-ROM drive B. A tiny electric switch from the button of a digital watch C. The electron source for a scanning electron microscope D. A read/write head from a hard drive
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