| 摘要 |
The target includes a module (141....1414) resting on a support and forming a strip and containing a structure support (20,21,28) on which rests a layer of an electrically conducting material (31,33). Two electrodes may generate a potential difference between them. At least two longitudinal faces (29,30) of each module are painted with different colors. A device (22,23) imparts rotation entire or a part of the modules to position on or other of the longitudinal faces on the front face of the target.
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