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单词
standard sand
释义
standard sand
[`stan·dǝrd `sand]
MATERIALS
A silica sand that is free of organic matter and is used in making test samples of concrete and cement.
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aircraft instrumentation
aircraft instrument panel
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aircraft machine-gun turret
aircraft noise
aircraft propeller
aircraft propulsion
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aircraft testing
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aircraft vectoring
aircraft weather reconnaissance
air crossing
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air-cut
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air cylinder
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air-defense artillery
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