在传统伦理道德规范方面，提出“五伦十教”的是（）。
A.周公
B.孔子
C.孟子
D.董仲舒
参考答案：C
什么是电池的工作电压？
A chain bridle is used when towing astern because it（）.
A.is easy to connect
B.provides an effective catenary and absorbs shock due to its weight
C.makes rigging a swivel unnecessary
D.prevents the tow from yawing by the drag of the chains in a seaway
