Counter-Obstacle Vehicle

军事名词，指反障碍车辆。

协方差

E[(X-E(X))(Y-E(Y))]称为随机变量X和Y的协方差，记作COV(X，Y)，即COV(X，Y)=E[(X-E(X))(Y-E(Y))^T]。

COV(X)=E[(X-E(X))(X-E(X))^T]

缩略语 abbr.

1.cerebral oxygen volume 大脑氧容量

2.check-out valve 止回阀

3.coefficient of variation 变异系数

4.communication operation van 通信作业车

5.concentrated oil of vitriol 浓矾油，浓硫酸

6.containing bovine heart cytochrome C oxidase 含牛心细胞色素C氧化酶

7.counter operating voltage 计数器工作电压

8.coverage of the femoral head 股骨头覆盖度

9.crack propagation 裂缝扩展

10.cross-over valve 转换阀，三通阀

11.cut-off value 截断值；判定值

12.cut-off voltage 截止电压

13.cut-out valve 断流阀