____________________ devices keep the valve closed when required.
Fill in the blank(s) with the appropriate word(s).
Valve-closing
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As a rule of thumb, how big should a first garden be for four people?
a. 1/3 acre c. 10 ft ? 10 ft b. 1 square foot d. 260 square feet
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What functions do preservatives perform?
What will be an ideal response?
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Which type of oil seal must NOT have oil applied to it for it to work correctly?
A) Silicon rubber B) Teflon C) Buna-N D) Viton
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____ is used more often in the production of transistors because of its ability to withstand heat.
a. Germanium b. Silicon c. Arsenic d. Iron
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