短波疗法是（）
A.欧姆耗损产热
B.机械产热
C.光辐射产热
D.介质耗损产热为主
E.共振吸收产热
参考答案：A
当用户管辖的线路要求停电时应如何处理？
The ship is now too much listing to portside. Which is the best way to keep the vessel upright?（）.
A.Put all the remaining cargo on starboard side
B.Put light cargo on starboardside and heavy cargo on port side
C.Put light cargo on port side and heavy cargo on starboard side
D.A,B,C are all correct
