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偶遇抽样
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偶遇抽样
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accidental sampling
偶遇抽样
研究者根据实际情况,为方便开展工作,选择偶然遇到的人作为调查对象,或者仅选择离得最近、最容易找到的人作为调查对象,又称便利抽样。
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aircraft jet tests in wind tunnel
aircraft jettison test in wind tunnel
aircraft landing distance
aircraft landing gear
aircraft landing gear structure
aircraft landing system
aircraft landing weight
aircraft large part collaborative assembly and measuring calibration system
aircraft leasing
aircraft level measurement
aircraft life
aircraft lifetime
aircraft lift-drag ratio
aircraft lift-off speed
aircraft lighting system
aircraft lighting system test
aircraft lightning test
aircraft load
aircraft look-down angle
aircraft low temperature test
aircraft maintenance
aircraft maintenance area
aircraft maintenance equipment
aircraft maintenance institution
aircraft maintenance speciality
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