软化瘢痕、松解粘连作用突出的是（）
A.干扰电疗法
B.音乐-电疗法
C.共鸣火花疗法
D.调制中频电疗法
E.等幅中频电疗法
参考答案：E
目前船舶最普遍采用的舵是（）。
A、平板舵
B、双支承平衡舵
C、多支承舵
D、悬挂舵
Having checked the doors were closed , and _________ all the lights were off, the boy opened the door to his bedroom.
A．why
B．that
C．when
D．where
