求翻译：然后将已曝光的胶片（供应商已提供）切成7-8条。取其中一条在标准条件下进行暗室处理。将测得的密度值（选择曝光参数时，应保证其密度值达到2.0±0.30）作为基准密度值。将其余几条已曝光胶片装入暗盒妥善保存备用。（注：此控制胶片必须存在一黑度范围为2.0-2.5的值。）是什么意思？

Then the exposed film (vendor provided) cut into 7-8 bar. Take one of the processing chamber under standard conditions. The measured density values ​​(selected exposure parameters should ensure that their density reached 2.0 ± 0.30) as the reference density value. The remaining few have been exposed

And then will have been exposed to the film (suppliers) has been cut into 7 -8. One of them under standard conditions for darkroom processing. The density value will be detected when parameters (select exposure should be assured that their density Value reaches 2.0 ±0.30 ) density value as the bench

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And then the exposure film (vendor provided) cut into 7-8. Take one of the standard conditions for darkroom processing. The measured density values (when choosing exposure parameters, should ensure that its density value reaches 2 ± 0.30) as the baseline density value. The remaining few exposed film

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