Chemical formula for carbon monoxide.

• A colorless, odorless toxic gas.

一氧化碳的化学式。

• 无色无味的有毒气体。

Initialism for commanding officer.

• The officer in charge of a unit.

指挥官的缩写。

• 负责一支部队的军官。

Initialism for corrections or correctional officer.

• A prison guard.

惩教官的缩写。

• 监狱看守人员。

Initialism for commissioned officer.

• An officer holding a commission.

委任军官的缩写。

• 持有委任状的军官。

Abbreviation for county in addresses and records.

县（county）的缩写，用于英文地址和登记。

Abbreviation for company, especially in firm names.

公司（company）的缩写，常见于公司名称。

Initialism for conscientious objector.

• One refusing military service on moral grounds.

良心拒服兵役者的缩写。

• 基于良心拒绝服兵役的人。

Abbreviation for cutoff, especially in technical or financial contexts.

截止（cutoff）的缩写，多用于技术或金融领域。

Initialism for common-offset method in seismic surveying.

地震勘探中的共偏移方法的缩写。

Abbreviation for cast on in knitting instructions.

编织说明中“起针”的缩写。