解放战争时期邓 * * 的贡献是： 

①开辟左右江革命根据地 ②与刘伯承率领解放军挺进大别山 ③指挥淮海战役 ④解放大西南 [ ]

A、①②③

C、①③④

B、①②④

D、②③④

Your vessel has a midship engine room and the cargo is concentrated in the end holds.The vessel is（）.

A.sagging with tensile stress on main deck

B.sagging with compressive stress on main deck

C.hogging with tensile stress on main deck

D.hogging with compressive stress on main deck