A.吊鉤吊點(diǎn)與被吊物重心盡可能近些; B.吊鉤吊點(diǎn)與被吊物重心盡可能遠(yuǎn)些; C.吊鉤吊點(diǎn)與被吊物重心在同一鉛垂線(xiàn)上; D.被吊物重心低些
A.0.1 B.0.2 C.0.3
A.3m B.4m C.5m