右离合器使主轴（），主要用于退刀，片数较少。
A.正转
B.反转
C.重新运动
D.左转
参考答案：B
紧张性头痛典型病例的起病年龄多在（）
A.10岁左右
B.40岁左右
C.20岁左右
D.30岁左右
E.50岁左右
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
