下列哪一种方法最直接了解组织有效供氧量（）
A.DO2
B.PaO2
C.SaO2
D.PaCO2
E.甲床颜色
参考答案：E
You are proceeding to a distress site．The survivors are in liferafts.What will make your ship more visible to the survivors（）.
A.Steering a sinuous course
B.Steering a zig-zag course
C.Turning on all available deck lights at night
D.Dumping debris over the side to make a trail to your vessel
磨辊间各工序的目的是什么？
