A、A.The open field system provided a good opportunity to experiment.
B、B.The open field system wasted land.
C、C.The open field system was wasteful of labor and time.
D、D.The open field system made livestock farming difficult.
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A、about which the vessel lists and trims B、which coincides with the center of buoyancy C、which，in the absence of external forces，is always vertically aligned with the center of gravity D、which is shown in the hydrostatic tables as VCB
A、aboat which the vessel lists and trims B、which coincides with the center of buoyancy C、which, in the absence of external forces, is always vertically aligned with the center of gravity D、which is shown in the hydrostatic tables as VCB
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