其含义解释如下：用四舍五入法试商，初商有时会偏大，就是把除数“四舍”或者被除数”五入”，都会有商偏大的情况出现，反之，把除数“五入”或者被除数“四舍”，会有商偏小的情况出现，所以要试商，同此也可根据此经验在试商时向偏大或者偏小方面试。
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普通厚度的水泥上墙，不能少于十五天的时间才能贴墙砖；要是水泥厚度达到五厘米及以上，则起码要三十天的的时间才能贴瓷砖。另外水泥凝固后，应对墙体做基面处理，检查有没有空鼓脱落问题现象，确保无误后才能施工。施工之前，要先用水把瓷砖浸湿，同时要把基层清理干净，基层一定不能有水分、沙粒以及空鼓等
My favorite movie is "The Shawshank Redemption." This film tells the story of a man named Andy Dufresne, who is wrongly convicted of murder and sent to Shawshank Prison. Despite the harsh conditions, Andy remains hopeful and forms a special bond with his fellow inmates.
What I love about this movie is its powerful message of hope, friendship, and the human spirit. It shows that even in the darkest of circumstances, one can find meaning and redemption. The performances by the cast are outstanding, especially Tim Robbins as Andy and Morgan Freeman as Red, who provides the narration throughout the film.
The story is both heartwarming and thought-provoking, making it a movie that I can watch over and over again. It has a way of touching my soul and reminding me of the importance of hope, kindness, and the power of the human spirit.
I highly recommend "The Shawshank Redemption" to anyone looking for a truly inspiring and unforgettable film experience.