题目内容
ADSL 可以在现有的用户电话线上通过传统的电话交换网，以重叠和不干扰传统模拟电话业务的方式提供高速数字业务。也就是说使用ADSL接入互联网，打电话的同时可以上网。
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开放系统互联参考模型的最高层的是应用层。
计算机网络就是联结起来的多台计算机构成的系统。
Project 3-Design of one-stage cylindrical gear reducer: Please follow me to complete the project 3 of one-stage cylindrical gear reducer that is based on top-down design method in the next five weeks. This project is full of challenges. The entire design process will combine the deep application of software Inventor professional, please pay 100% effort to the final project!Follow the instruction of teacher Song to finish the design of the one-stage cylindrical reducer carefully.1. Complete the reducer model based on reverse engineering and top-down design approach;2. Complete the assembly drawing of the reducer by yourself independently;3. The transmission power is 1-5KW, the interval is 0.5kw, for examples, 1KW, 1.5kw, 2kw etc.;4. The speed ratios are 1.6, 1.8, 2, 2.5, 2.8, 3.15, 3.55, 4.0, 4.5, 5..., the center distances are 63, 71, 80, 90, 100, 112, 125, 140, 160... , all important variables you determined should be various from your classmates.5. Gear module should be 2, 2.5, 2.75, 3, 3.5, 4, 4.5, or 5 ...
债权人甲下落不明，致使债务人乙难以履行债务。为履行到期债务，债务人乙将标的物提存。根据合同法律制度的规定，下列表述中，正确的是（ ）。
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