下列行为倾向中，符合人际交往正确原则的是（）

A．自恃清高，看不起别人 

B．互相利用，讲究“人情交易” 

C．斤斤计较，为一点小事耿耿于怀 

D．互助互惠，在别人需要时奉献自己的力量

“safe speed” is defined as that speed where（）.

A.you can stop within your visibility range

B.you can take proper and effective action to avoid collision

C.you are traveling slower than surrounding vessels

D.no wake comes from your vessel