Most greenhouses are made of fiberglass or polyethylene

Indicate whether the statement is true or false


True

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?The hardened excretion of the lac bug has unique properties, and can be made into____. 

A. ?horse bridles B. ?furniture C. ?combs  D. ?coatings

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____ produce electricity by chemical action.

a. Batteries b. Solar cells c. Thermocouples d. Piezoelectric devices

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Troubleshooting Reach-In / Medium Temp - Diagnosis: Inefficient compressor (slightly)

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In a root pass, the penetration is controlled by using the correct torch travel speed and _____

A) work angle B) amperage C) voltage D) travel angle

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