O-rings used in R-134a systems are usually ______________

A) Green
B) Black
C) Red
D) Orange


A) Green

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The primary mission of OSHA is to _____.

a. ensure that the employer maintains a safe workplace b. catch people violating safety regulations c. assign safety inspectors to all job sites d. make rules and regulations covering all aspects of construction projects

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The cells within the testicles that produce testosterone are called the Leydig or interstitial cells

Indicate whether this statement is true or false.

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What are the possible points of entry for outside air into a greenhouse during passive cooling?

What will be an ideal response?

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The process by which thermal energy is transferred by a solid is called __________.

A. convection B. conductance C. radiation

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