答案:(1)Heparin-- Enhance the activity of antithrombin III (AT III), resulting in direct inhibition of thrombin about 1000-fold-- Used in vivo (by injection) or in vitro, rapid-- Reversal by protamine sulfate(2) Warfarin-- Vitamin K antagonists that block vitamin K epoxide reductase, resulting in inhibition of the activation of coagulation factors-- Used in vivo (oral administration)-- Reversal by VK or fresh frozen plasma