... metre bridge滑线电桥，米尺电桥 metre rule米尺 mica云母 ...
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metre e rule 米尺
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meterstick , metric scale
On April 21st the CAA established a new rule, deeming regions thought to have less than 2, 000 micrograms of dust per cubic metre safe for flight.
ECONOMIST: Volcanoes and air travel: Small eruption in Iceland | The
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