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【单选题】
吊杆头端升起时,其轴线与水平面的夹角叫吊杆仰角,又叫吊举角,装卸作业时,轻型吊杆仰角一般为________。A.
20～75°
B.
15～60°
C.
15～75°
D.
20～60°
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