认为“温为温病，热为热病，……与温疫辨者无他，盖即辨其传染与不传染耳”的医家是
A．吴又可B．叶天士C．周扬俊D．陆九芝E．王叔和
参考答案：D
You are the first vessel to arrive at the scene of a distress. Due to the volume of traffic on the radio，you are unable to communicate with the vessel in distress. Which action should you take?（）
A.Switch to flag hoists
B.Broadcast "Seelonce Distress"
C.Broadcast "Charlie Quebec-Mayday-Quiet"
D.Key the microphone three times in quick succession
什么叫空气波？什么叫空气波速？
