1, the abbreviation of aircraft carrier, is a large surface warship and the largest naval surface warship with carrier-based aircraft as its main weapon and as its maritime activity base. It is mainly used to attack surface ships, submarines and transport ships, attack coastal facilities and strategic targets on land, seize air and sea control rights in combat waters, and support landing and anti-landing operations.

2. The abbreviation of cost deviation refers to the difference between the budgeted cost of an activity and the actual cost of the activity. In earned value, cost deviation (CV)= earned value (EV)- actual cost (AC).

3, coefficient of variation, when it is necessary to compare two groups of data, if the measurement scale of the two groups of data is too different, or the data dimensions are different, it is not appropriate to directly compare with the standard deviation. The coefficient of variation can eliminate the influence of measurement scale and dimension, which is the ratio of standard deviation of original data to average value of original data.

Commercial vehicle is a kind of automobile designed and technically used to transport people and goods. Commercial vehicles include all trucks and buses with more than 9 seats, which are divided into five categories: passenger cars, trucks, semi-trailer tractors, passenger cars and trucks.

The abbreviation of computer vision is the science that studies how to make machines "see". Further, it refers to using cameras and computers to identify, track and measure targets instead of human eyes, and further processing the graphics, so that computers can process images that are more suitable for human eyes to observe or send them to instruments for detection.

Extended data:

The coefficient of variation is defined only when the average value is not zero. When comparing the degree of variation of two or more data, if the unit of measurement is the same as the average, the standard deviation can be directly used for comparison. If the units and/or average values are different, the standard deviation cannot be used to compare the degree of variation, but the ratio of standard deviation to average value (relative value) should be used for comparison.

The size of the coefficient of variation is influenced by the average value and standard deviation, so it is best to list the average value and standard deviation when using the coefficient of variation to express the degree of variation of data.