What characteristic must a refrigerant have if it is used as a drop-in replacement for another refrigerant?
a. Similar molecular structure
b. Compatible with existing compressor oil
c. Similar operating pressures and temperatures
d. Higher flammability
c
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A typical come-along _____.
a. has a flat, synthetic strap
b. has a higher lifting capacity than a ratchet-lever hoist
c. is equipped with both a chain and a cable
d. cannot be used for vertical lifting
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What was the greatest threat to the stability of American society in the 1930s? Was there ever any serious threat that the United States could have turned away from democracy as many other nations did during the Depression?
What will be an ideal response?
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Hard hats are tested to withstand how many foot-pounds of impact?