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第77章 纱布与刻度 凌晨五点四十分。闹钟尚未响起，林尘已经睁开眼。天花板上的水渍轮廓在灰白的光线里逐渐清晰，像一张褪色的地图。他先活动脚趾。左脚大拇趾传来明显的牵拉感，创面边缘的纱布已经半干，但内侧仍有黏腻的湿意。渗液没有停止。他掀开薄被，坐起，从床底摸出碘伏、无菌纱布和医用胶布。动作很慢。撕开旧胶布时，皮肤被扯得发紧，他屏住呼吸，用镊子夹起棉签，蘸取碘伏，从创面中心向外螺旋擦拭。淡黄色的组织液被吸走，露出底下暗红色的新生肉芽。没有...
Chapter 76: Closed Exams and Bandages The wind in the corridor passed through the window frame, carrying the chill of early autumn. Lin Chen locked the door. Twenty five centimeter strides. When his left foot touched do...
第76章 闭卷与绷带 走廊的风穿过窗框，带着初秋的凉意。林尘锁上门。步幅二十五厘米。左脚落地时，硬纸板鞋垫与创面摩擦，传来一阵钝痛。他没有停。沿着楼梯下行，水泥台阶的棱角在晨光中泛着灰白。七点四十分。距离开考还有二十分钟。 三教204的教室门开着。里面已经坐了大半人。他挑了靠窗倒数第二排的位置坐下。帆布包放在脚边。监考老师发卷。纸张翻动的声音很轻。他翻开试卷。第一题：射频衰减器的温漂系数计算。第二题：阻抗匹配网络设计。第三题：频谱仪本...
Chapter 75: Ledger and Remaining Balance Wind poured in from the far end of the corridor, carrying the dry chill peculiar to early autumn. Lin Chen hitched up the strap of his canvas bag, tightening it against his colla...
第75章 账本与余量 风从走廊尽头灌进来，带着初秋特有的干冷。林尘把帆布包的肩带往上提了提，勒紧锁骨。左脚踩下台阶，硬纸板鞋垫与创口边缘摩擦，传来一阵钝痛。他调整重心，步幅控制在二十五厘米。不踩水渍。不踩碎石。 二十一天。七百九十六块。平均每天三十八块。他脑子里的账本已经自动拆解。勤工助学岗的排班表昨天已经截止，图书馆和食堂的路径被堵死。剩下的选项只有三条：校外家电维修、旧书回收、实验室耗材代管。最后一条需要导师签字，流程至少拖三天，...
Chapter 74: Baseline and Gap The knob had a heavy drag to it. Lin Chen did not turn it immediately. He checked the stopwatch first. Eight minutes and forty seconds remained. A 0.2 dB offset—if he forced the adjustment i...
第74章 基准与缺口 旋钮的阻尼感很重。林尘没有立刻转动。他先看了一眼秒表。还剩八分四十秒。零点二dB的偏移，如果直接硬拧，会引入接触电阻的突变，导致底噪再次跳变。他必须分步补偿。第一步，将衰减器打到5dB档，观察曲线回落斜率。第二步，记录回落至零点一dB时的旋钮刻度。第三步，用剩余时间做微调。 他伸出右手。食指和拇指捏住金属旋钮。指腹能感觉到螺纹的细微磨损，以及内部弹簧的微弱回弹。他顺时针拧动一格。咔哒。屏幕上的绿色波形向下沉了零点...
Chapter 91: Cold Start Daylight had not yet broken. The motion sensor light in the corridor was off. Lin Chen opened his eyes. He did not get up at once. First he flexed his toes. Under the dressing on his left foot, th...
第91章 冷机启动 天光未亮。走廊的声控灯灭着。林尘睁开眼。没有立刻起身。他先活动脚趾。左脚敷料下的皮肤有轻微的黏连感。边缘确实潮了。汗水与碘伏混合。他缓慢屈伸踝关节。痛感在可接受阈值内。步态预案依然有效。他掀开薄被。坐起。穿鞋。系紧鞋带时特意留出半指空隙。避免压迫伤口。 六点整。他拧开水龙头。冷水冲刷面部。毛巾拧干。折叠。放回原处。背包检查。准考证。身份证。黑色钢笔。备用笔芯。橡皮。草稿纸。全部就位。他摸了摸口袋。七块三。纸币平整。...
Chapter 88: Threshold and Margin The clock in the lower right corner of the screen ticked forward. 119 minutes 59 seconds. Lin Chen did not start typing code immediately. He read the prompt first. Three times. Pulled ou...
第88章 阈值与余量 屏幕右下角的时钟跳动。119分59秒。林尘没有立刻敲代码。他先读题。三遍。提取约束条件：实时数据流、内存峰值2MB、运行时间2秒内、C语言。TC2.0的默认内存模型是small，数据段和代码段各64KB。2MB是总物理限制，但实际可用堆栈更小。他必须在栈外分配内存，或者用静态数组。实时滤波，数据量未知。假设每秒100个采样点，两秒200个。用滑动平均？计算量小，但延迟高。用一阶IIR？递归计算，内存占用极低，但系...
Chapter 87: Redundancy and Thresholds The whispering next door vanished completely. The corridor returned to dead silence. Only the faucet kept dripping, steady as the ticking of a second hand. Lin Chen did not turn on...