A.2m托尺检查B.5m托尺检查C.5m拉线和尺检查D.2m靠尺检查
A.250B.500C.1000D.1500
A.1m或者1步脚手架高度内B.1m或者1.5步脚手架高度内C.1.5m或者1步脚手架高度内D.1.5m或者1.5步脚手架高度内