Before you touch a wire in an appliance, how should you make sure that it is not energized?
a. by testing for leakage with an ohmmeter

b. by plugging in the line cord and closing the appliance switch

c. by touching the grounded and black wires and watching for a spark

d. by checking for voltage with a neon tester

What is added to the < meta > tag to describe the encoding type?

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)

Why would a programmer use the logical operator and in an if statement? a: when an action is to be taken that requires both conditions to be falseb: when an action is to be taken that requires both conditions to be truec: when an action is to be taken that requires the first condition to be falsed: when an action is to be taken that requires the second condition to be truei took the test and the answer is b.