What material are electric heater coils often made from?
A) Silicon carbide B) Nickel-chrome alloy wire
C) Steel and chrome alloy wire D) Copper and brass
B
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The type of bacteria that symbiotically fix nitrogen are ____________________
Fill in the blank(s) with correct word
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The electrostatic process uses a paper coated with:
A. Silver B. Zinc C. Ammonia D. Mylar
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Which system is designed to evaluate how efficient the heating of a pump is?
A) SEER B) Energy Star C) EER D) HSPF
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XOR is an abbreviation for exclusive-OR
Indicate whether the statement is true or false
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