知一传动轴传递的功率为37kW，转速n=900r/min，若轴上的扭切应力不许超过40MPa，该轴的直径为（）mm。
参考答案：
解析：
粘贴片的时候及时清理（）是非常重要的环节，可以避免流入甲沟。
A、粉尘
B、贴片胶
C、污渍
D、水晶甲液
Which of the following statements about duration is FALSE （）
A. There is a direct relationship between yield to maturity and duration.
B. There is an inverse relationship between coupon and duration.
C. There is a direct relationship between duration and maturity.
