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马、骡、牛和骆驼等家畜在拉犁、拉车时佩戴的与畜体连接便于驾驶的用具。家畜拉挽重物时使劲的立足点,也可以避免畜体使劲时的呼吸不畅和摩擦受伤。
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rocket dynamic test tower
rocket ejection seat
rocket engine ignition test at high altitude
rocket engine precooling
rocket engine test
rocket exploration of the upper atmosphere
rocket fairing
rocket flow-out test
rocket for artificially triggering lightning
rocket ground support equipment
rocket highway transporter
rocket infrared astronomy
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rocket motion equation
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rocket-ramjet combined cycle engine
rocket range safety control
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rocket static test-firing facility
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rocket ultraviolet astronomy
rocket X-ray astronomy
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