能见度
参考答案：具有正常视力的人在当时的天气条件下还能够看清楚目标轮廓的最大地面水平距离。
Would you mind _________ me some cents? I would like ________ a phone call.
A．lending, to make
B．borrowing, to make
C．to lend, to make
D．borrow, making
洋地黄中毒最常见的心电图表现是（）
A.Q-T间期缩短
B.ST-T呈现鱼钩样改变
C.窦性心动过缓
D.室性期前收缩二联律
E.房室传导阻滞
