题目内容
（请给出正确答案）
A.溶剂水被认为是只提供介电常数(D)的连续介质，完全忽略加入电解质后溶液介电常数的变化以及水分子与离子间的水化作用;
B.溶质完全离解成离子;
C.离子间的相互作用只有库仑力，而其他作用力都忽略不计;
D.离子是带电的硬球，电荷不会被极化，离子电场球形对称。
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A.雅克·罗格
B.托马斯·巴赫
C.皮埃尔·德·顾拜旦
D.胡安·安东尼奥·萨马兰奇
听力原文： It was 4:45 am. The Rockfort Express, travelling at about 15 m. p. h, rolled onto the 600 ft long bridge across the Mavudayer River. About an hour earlier a powerful bomb had exploded under the far end of the span, which tore the track. The engineers of the train were unable to stop. Then eight of 17 carriages were derailed.
At the time of the accident, many of the 1,000 or so passengers were asleep. It was reported that 25 were killed and 214 injured, 139 seriously.
At week's end police arrested a man, 28, who confessed to complicity in the bombing for a political purpose.
What's the length of the bridge across the Mavudayer River？
A．600 inches.
B．600 feet.
C．300 inches.
D．15 meters.
