阀门渗漏的原因可能是（）
A.填料老化
B.法兰螺栓不紧固
C.阀门内漏
D.填料压盖松
参考答案：A, B, D
After the professor, ____ out the project made a comment on the report, the media focused on it. [ ]
A. was opposed to carry
B. opposed to carry
C. opposed to carrying
D. opposed carrying
男性，邱岁，查体心底部有舒张期哈气样杂音，以胸骨右缘第2肋间最响，第二心音亢进，血压170/90mmHg，胸片提示主动脉增宽扭曲，心影靴形，最可能的诊断是
A．风湿性主动脉瓣关闭不全
B．先天性心脏病，二叶式主动脉瓣
C．主动脉粥样硬化，主动脉瓣关闭不全
D．肺动脉高压，相对肺动脉瓣关闭不全
E．高血压性心脏病
