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MS 模式总结

标记说明​

标记含义要求
M1Method mark正确的方法/步骤
A1Answer mark正确的最终答案
B1Behaviour mark正确的独立陈述

常见 MS 短语​

Truth Table​

  • "M1：all input combinations listed correctly"
  • "A1：all output values for first gate"
  • "A1：all final output values"

K-map​

  • "M1：correct transfer of values to K-map"
  • "M1：correct grouping of adjacent 1s"
  • "A1：simplified Boolean expression correct"
  • "A1：written in SOP form"

Boolean Simplification​

  • "M1：correct application of De Morgan's law"
  • "M1：correct simplification step shown"
  • "A1：fully simplified expression"

Flip-flop​

  • "B1：correct Q(t+1) for S=0,R=0 (hold)"
  • "B1：correct Q(t+1) for S=0,R=1 (reset)"
  • "B1：correct Q(t+1) for S=1,R=0 (set)"
  • "B1：identifies S=1,R=1 as invalid"

Examiner Tips​

  • 化简题 展示中间步骤 可得 M1
  • K-map 圈选 不唯一，多种合法圈法都给分
  • 从 truth table 到 K-map 填错会连锁失分，但正确的方法仍然给 M1