I have three exposures left on this film.

这卷胶卷我还有三张未拍。

Block out this unimportant detail at the top of your picture.

上把图像上部的这个不重要的细节涂抹掉。

Through controlling the each step in process of darkroom disposal,improve the quality of the sciagram efficently.

通过对暗室处理过程中各个环节的控制,有提高射线的质量。

How many exposures have you made?

你拍过几张了?

For areas where the film density through the weld varies by more than from the density through the penetrameter, an additional penetrameter shall be used for those areas.

当焊缝区域黑度变化超过透度计处黑度，该处另加透度计。