52岁，男，胸痛，体重下降，请结合胸片选出最可能的诊断是
A.包裹性胸腔积液
B.胸膜肥厚
C.化脓性胸膜炎
D.肺癌
E.胸膜间皮瘤
参考答案：E
Is this the second time that you _________ the Summer Palace?[ ]
A. visit
B. are visiting
C. had visited
D. have visited
高速铁路实行天窗修制度，天窗应为垂直天窗，时间一般不少于（）.
A.300min
B.180min
C.360min
D.240min
