When in command of a lifeboat under oars，the command TOSS OARS means to（）.

A.lift oars to vertical position，trim blades fore and aft with handles resting on the thwarts

B.complete the stroke，come to Oars，raise the oars smartly to the vertical，rest handles on footings and trim blades fore and aft

C.place oars in row locks directly from the boated position or from Stand by oars position

D.complete the stroke (when rowing in ahead motion)，raise the oars with crook of elbow to about 30 degrees，swing blades forward

计算题：重25t，长8m及重6t，长4m的均重箱形货物各一件，拟用N12型60t平车（底架长12.5m，销距9.35m）一辆装运，试确定装载方案。