单项选择题
The pillar shape that gives the greatest strength for the least weight is the（）.
A.octagonal pillar B.H Beam pillar C.I Beam pillar D.circular type pillar
单项选择题 The normal tendency for a loaded tanker is to（）.
单项选择题 The maximum theoretical stress that can be developed on a guy in a yard and stay rig is limited by the（）.
单项选择题 The load chart of a crane enables the operator to combine the load radius with boom length to determine the（）.
