A line-sensing control uses a mechanical thermostat or electrical controller to measure the _____.
a. actual pipe temperature
b. ambient temperature surrounding the pipe
c. estimated pipe temperature
d. heat levels surrounding the pipe
a. actual pipe temperature
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____ backflow is a reversal of normal flow in a system caused by a negative pressure (vacuum) in the potable water supply.
a. Gravity b. Back-siphonage c. Back-pressure d. none of the above
Al enhebrar un terminal de cuña, la sección abierta del cable debe alinearse con la línea central de _____.
a. el perno b. el sujetador para cable c. la cuña d. un casquillo
You can start Emacs by entering the ____ command in the terminal window or at a command line in UNIX/Linux.
A. e B. em C. emcs D. emacs
In an area where there is smoke or pollution, what is the recommended number of air exchanges per hour?
Fill in the blank(s) with the appropriate word(s).