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计算机网络就是联结起来的多台计算机构成的系统。

A. 对
B. 错

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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（）。

A. 提存费用由乙负担
B. 标的物提存后，毁损、灭失的风险由乙承担
C. 甲领取提存物的权利，自提存之日起 5 年内不行使则消灭
D. 若甲自提存之日起 5 年内不领取提存物，提存物归乙所有

甲乙订立电脑买卖合同，合同约定甲先交付，乙再支付价款，甲按期交货，乙无正当理由拒绝受领，甲将该批电脑提存，关于该案说法正确的有（）。

A. 甲应当及时通知乙领取电脑
B. 甲可以要求提存部门在乙未支付价款的情况下拒绝乙领取提存物
C. 乙若未按期支付价款，甲可以支付提存费用后取回提存物
D. 乙若向提存部门书面放弃领取提存物，提存物收归国有

细胞体积的大小和生物体体积大小无关,生物体体积的增大是细胞()增加的结果。

A. 体积
B. 数量
C. 体积和数量
D. 质量