采用简单随机取样法，研究了高速公路匝道入口前的标志植物对驾驶员反应时间的影响。
By using the simple random-sampling method, this paper researches on the influence of the mark plants before the entry point of superhighway's ramp on the responding time of the driver.
采用简单随机取样法，研究了高速公路匝道入口前的标志植物对驾驶员反应时间的影响。
By using the simple random-sampling method, this paper researches on the influence of the mark plants before the entry point of superhighway's ramp on the responding time of the driver.
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