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在Photoshop教学中,选取贴近学生日常生活的任务案例对教材进行补充,遵循姜大源"六步法"行动策略进行任务驱动教学,使学生保持学习兴趣,让技能训练更加贴近生活实践。 相似文献
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This paper we study a general discrete SIR epidemic model which is derived from SIR model with distributed delay and general nonlinear incidence by using a variation of the backward Euler method.Applying a Lyapunov functional technique,it is shown that the global dynamics of each discrete SIR model is fully determined by a single threshold parameter. 相似文献
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