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【多选题】
关于单轮式横向力系数测试系统测试路面摩擦系数,以下说法正确的是( )。A.
测试轮胎标准气压：350±20kPa。
B.
洒水位置应在测试轮接触地面中点沿行驶方向前方400±50mm处，洒水宽度应为中心线两侧各不小于约75mm。
C.
正式开始测试前首先应按规定的时间要求启动控制单元进行通电预热。
D.
进入测试路段后，驾驶员应保持较为均匀的行车速度，并沿正常行车轨迹行驶。
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