Engine: Expired / General Subjects

1. A After the steel is heated above its critical temperature, it is quenched in a carbon bath.
2. B After the steel is heated above its critical temperature, it is quenched in cold water.
3. C After the steel is heated above its critical temperature, it is allowed to cool slowly in air.
4. D After the steel is heated above its melting temperature, it is quenched in a carbon bath.

Tip: press A-D to answer