对于KU波段卫星通信的可靠性影响最大的气候现象是（）。
A.长期干旱
B.秋冬季的浓厚天气
C.夏季长时间的瓢泼大雨
D.沙尘暴
参考答案：C
It was because of his hard training that he the champion in 3 sets. [ ]
A. defeated
B. won
C. failed
D. was defeated
门静脉高压症施行门奇断流术的主要优点不包括
A．手术后肝性脑病的发生率较门腔分流术少
B．手术相对较简单，易于推广
C．既能控制出血又能保持肝脏血液供应
D．手术创伤较小，病人恢复快
E．明显降低门静脉压力，减少再出血机会
