A.透射式能見度儀B.前向散射式能見度儀C.側(cè)向散射式能見度儀D.后向散射式能見度儀
A.20°~50°B.40°~60°C.60°~100°D.180°
A.人工觀測能見度B.透射式能見度儀C.散射式能見度儀D.激光雷達(dá)能見度儀