[多项选择]以下关于校准和检定的说法中，正确的有( )。
A. 校准是企业的自愿行为，而检定具有法制性
B. 校准主要确定测量仪器示值误差，而检定则是全面评定其计量特性和技术要求
C. 校准和检定都必须作出合格与否的结论
D. 校准规范和检定规程可由企业自行制定
E. 校准和检定是实现量值溯源最主要的技术手段

My Views on Food Wasting
With the improvement of living standards, the phenomenon of food wasting has grown far more common than ever, to which people seem to be accustomed. Xi Jinping, general secretary of the Communist Party of China Central Committee, called for frugality, which pushed the tricky problem in the teeth of the storm.
The main reasons of the phenomenon mentioned above lie in bad social morality and rapid economic development. To begin with, the ever rising living standard enables people to demand better quality and style of what they eat, while practicing thrift seems to be out of date. In the next place, the Chinese, influenced by the treat tradition of "Surplus Year after Year", intend to show their hospitality and affluence. What’s more, banquets at public expenses have led to more shocking wasting scenes.
How can we tackle the issue with urgency First and foremost, government should guide people to change inherent concept and to uphold the traditional virtue of diligence and thrift. Besides, relevant supervision and penalties shall be conducted timely and properly.