X线照片上所指的关节间隙，代表解剖学上的()
A．关节腔
B．关节囊
C．关节软骨
D．关节囊和关节腔
E．关节腔和关节软骨
参考答案：E
—— Have you ever seen anything like that before？
---- ____.
A．No，I never have seen anything like that before
B．No，never I have seen anything like that before
C．No，never have 1 seen anything like that before
D．No，I have seen anything like that before never
48伏中达开关电源浮充电压为（）
A.54V
B.44V
C.56.4V
