患者男性,47岁,无症状。心电图如图5-20所示,应诊断为()。
A.右心室肥厚
B.预激综合征
C.完全性右束支阻滞
D.完全性左束支阻滞
E.后壁心肌梗死
参考答案:C
人体传导最快的神经纤维是至骨骼肌的粗的有髓鞘的运动纤维,其传导速度_____m/s。=
A restaurant orders 150 kg of pumpkins from the farmer’s market. The farmer fills the order with 23 pumpkins. The average mass of the first 20 pumpkins is 6.5 kg. What must be the minimum average mass of the remaining 3 pumpkins to fill the order ?()
A. 5.5 kg
B. 5.67 kg
C. 6.67 kg
D. 7 kg
E. 11.5 kg