____________________ systems use a spark igniter (direct spark ignition) or a silicon carbide igniter (hot surface ignition) to light the main gas burner directly.

Fill in the blank(s) with the appropriate word(s).


Direct ignition

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Water is one of the most essential resources for human existence. No civilization has ever existed without access to fresh

water for domestic use. How much water is used for domestic purposes?

What will be an ideal response?

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____________________ include simple, one-celled organisms that are considered soil microfauna and

are the most abundant inhabitants in soil. They are often rod-shaped and not visible to the naked eye. They may grow in chains or colonies.

Fill in the blank(s) with the appropriate word(s).

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Define core.

What will be an ideal response?

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Technician Asays a fuse should only be replaced with the same ampere rating as the original designed for the circuit.  Technician B says circuit breakers can be replaced with one of a slightly lower ampere rating if the original size designed for the circuit is not available. Who is correct??

A. ?Technician A only B. ?Technician B only C. ?Both A and B D. ?Neither A nor B

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