t1＝-b/2a+√b2-4ac／2a t2＝-b/2a-√b2-4ac／2a 讨论：（1）当b2-4ac＞0时，有两个不相同的实数根。（2）当b2-4ac＝0时，有两个相同的实数根-b/2a。（3）当b2-4ac＜0，原方程无解。
https://ggplot2.tidyverse.org. Sievert C. Interactive web-based data visualization with R, Plotly, and Shiny. Chapman and Hall. 2020. https://plotly-r.com. Untergasser A, Cutcutache I, Koressaar T, Ye J, Faircloth BC, Remm M, Rozen SG. Primer3—new capabilities and interfaces. ...
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测试标准 802.3af/at/bt 软件 自动 功能套件 POE电源 可售卖地 上海;江苏;浙江 型号 PSA3000 价格说明 价格:商品在爱采购的展示标价,具体的成交价格可能因商品参加活动等情况发生变化,也可能随着购买数量不同或所选规格不同而发生变化,如用户与商家线下达成协议,以线下协议的结算价格为准,如用户在爱采购上...
2. Operating expenses (after deductions of business taxes and surcharges) divided by operating income. 3. Capital adequacy ratios were calculated in accordance with the relevant regulations of the Capital Rules for Commercial Banks (Provisional). The advanced capital measurement approaches have been ...
[2019.05] [Chinese Blog] C^3 Framework系列之一:一个基于PyTorch的开源人群计数框架 [Link] [2019.04] Crowd counting from scratch [Link] [2017.11] Counting Crowds and Lines with AI [Link1] [Link2] [Code] GT generation Density Map Generation from Key Points [Matlab Code] [Python Code] [Fast...
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Fig. 2 Dispersal of different preformed biofilms by the nitric oxide donors SNAP, Noc-5 and NO-aspirin on polystyrene during exposure at 4 °C. Concentrations of the nitric oxide donor are on the x-axis. Residual biofilms were quantified by staining with crystal violet. Error bars are standar...
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