73 術中神經肌肉四連刺激監測(train-of-four, TOF)出現兩個肌肉抽動(twitch)反應時,此時的神經肌 肉阻斷程度為何?(A)強烈阻斷(intense block)(B)深度阻斷(deep block)(C)中度阻斷(moderate block)(D)恢復狀態(recovery)