If a binary signal is sent over a 3-khz channel whose signal-to-noise ratio is 20db, what is the maximum achievable data rate? ( analyze based on nyquist theorem and shannon theorem. maximum data rate is limited by the smaller value of nyquist limit and shannon limit. note that, the s/n in shannon equation is just a ratio, not in the unit of ‘db’.)

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health? a. air quality data gathered by new instruments can be used to reduce exposure to pollutants. b. new technologies enable natural and human-made pollution sources to be located and monitored. c. air quality data gathered by new instruments can be used to predict trends in pollution over time. d. new technologies allow governments to make informed decisions about the regulation of pollution. (choose more than one)

Acase study allows a more detailed look at the life of a single subject than any other study.

What type of slide show is a dynamic and eye-catching way to familiarize potential customers with what your company has to offer? a. ole b. photo album c. brochure d. office clipboard