Some plants are highly sensitive to low concentrations of fluoride commonly put in water systems to prevent tooth decay

Indicate whether the statement is true or false


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The _____ technique is done by resting the cup on the workpiece.? ?  

A. resting the cup? B. beveling? C. walking the cup? D. freehand?

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Early engines were called flat head designs because they ________

A) Used spark plugs at the top of the cylinders B) Were only inline engines C) Did not include valves D) Used valves located in the cylinder block

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Which of the following are the most commonly used types of fire hose couplings?

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Examples of control devices include:

A) Compressors, signal lights, and defrost timers. B) Motors, resistance heaters, and solenoid valves. C) Compressors, thermostats, pressure switches, and heaters. D) Thermostats, pressure switches, and humidistats.

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