单项选择题
A.滑行法吊装B.旋转法吊装C.双机抬吊D.两点绑扎起吊
A.60sB.90sC.120sD.150s
A.2.5hB.2hC.1.5hD.1h
A.40%~50%B.40%~90%C.50%左右D.50%~90%
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