單項(xiàng)選擇題在施工天窗作業(yè)時(shí),對技改工程、線路大中修己大型機(jī)械作業(yè)時(shí)間()

A.不應(yīng)小于60min
B.不應(yīng)小于90min
C.不應(yīng)小于120min
D.不應(yīng)小于180min