SLE病人发生无菌性骨坏死，最常见的部位是（）。
A.膝关节
B.肱骨头
C.胫骨头
D.股骨头
E.踝关节
参考答案：D
激发滤光片有两种，UG和BG，下列说法正确的是（）
A.UG为紫外光滤片，只允许波长325～500nm的紫外光通过
B.BG为蓝紫外光滤片，只允许波长325～500nm的蓝紫外光通过
C.UG为蓝紫外光滤片，只允许波长275～400nm的蓝外光通过
D.BG为紫外光滤片，只允许波长275～400nm的紫外光通过
E.UG的最大透光度在410nm，BG的最大透光度在365nm
Why are the prices of mobile telephone services lower in China’s eastern coastal region a. The average disposable income is lower in the region. b. The GDP is higher in the region. c. The costs of operators are lower due to a greater number of users of mobile phone services in the region. d. The operators compete with each other in order to win over subscribers.
