单项选择题
The center of gravity of a freely swinging load suspended from a pedestal crane acts as if it were located at the（）.
A.counterweight B.pedestal C.longitudinal centerline D.point of suspension
单项选择题 Strengthening damaged bulkheads by using wood or steel is called（）.
单项选择题 Stanchions prevent the entire deck load on a ship from being carried by the（）.
单项选择题 Stable equilibrium for a vessel means that the metacenter is（）.
