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The printed materials in the training materials do not include ().
Answer: b

Training materials and related tools. Training materials are divided into two categories: printed materials and audio-visual materials. Printed materials mainly include books, manuals, guides, charts, test papers, etc. Audio-visual materials mainly include videotapes, CDs and audio recordings. Training-related tools refer to projectors, notebook computers, slide projectors, stereos, video recorders and other training aids.