When a man says "I have five children", normally he means that he has five and only five children. This implicature is possible as a result of his following the maxim of ______.
A. quality
B. quantity
C. manner
D. relevance
Which of the following is NOT mentioned in the passage
A. Dwight's competitiveness.
B. Dwight's interest in work.
C. Dwight's talents as a leader.
Dwight's great ambition.
洋地黄中毒最容易引起的心电图表现是
A. QT间期延长
B. 室性期前收缩二联律
C. ST-T呈鱼钩样改变
D. 第三度房室传导阻滞
脊柱骨折和脱位最基本的辅助检查是
A. MRI检查
B. CT检查
C. X线检查
D. B超检查
微信支付 
支付宝支付