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    There are several different types of electron microscopes, including the transmission electron microscope (TEM), scanning electron microscope (SEM), and reflection electron microscope (REM.) ... Transmission electron microscope (TEM) .

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    SEM is Search engine marketing and it consists SEO And PPC

    1) SEO is the method to derive traffic organically from search engines
    2) PPC is the method to derive traffic via spending money on Google adwords and Yahoo-Bing and other search engines.

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    There are 6types os SEM, and it follows

    Conventional (high vacuum) SEM.
    Variable Pressure or Low Vacuum SEM.
    Cryo on an SEM (Cryo-SEM)
    Environmental SEM.
    The focused ion beam (FIB)
    Electron-beam (E-beam) lithography.

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