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| English | Thesaurus |
| c.，cd. | candlepower |
| 4C-CD | Capital District Child Care Coordinating Council |
| C⁴D | conductively connected CCD (Ladungstransfertechnik) |
| C/I | carrier /interference ratio |
| C³L | complementary constant-current logic |
| C/N | carrier/noise ratio |
| C³RAM | continuously charge-coupled random-access memory |
| I.C.R.P. | International Commission on Radiological Protection |
| p.c.b. | printed circuit board |
| SE/C | southeast corner |