The answer is 2 frequencies.
A Full-Duplex QAM 64 K Modem uses two frequencies. One frequency is used for upstream and the other for downstream. A variety of common QAM forms are available and include, 16 QAM, 32 QAM, 64 QAM, and 256 QAM. For example, for domestic broadcast use, 64 and 256 QAM are used for cable modem and digital cable TV. The modulation scheme for this modem uses both amplitude and phase.
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Answer:
On-line css
Explanation:
Web design is the development of web pages using web development tools like HTML ( hypertext mark-up language), CSS and JavaScript. HTML is not the main code itself, because it only uses it's tags of elements to mark layout of the page. External and in-line css are used differently. In-line css is used directly on the HTML elements in the HTML file to style the element property, but external CSS is a CSS file that addresses a html element file.
A) Records of the dates and quantities of refrigerant recovered and recycled are unnecessary
