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单项选择题

地震波中破坏比较强的是哪种波（）
A、横波B、纵波C、驻波D、谐波

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单项选择题
美国甲公司于4月9日发商务电传至中国乙公司，该电传称、“可供小麦2000公吨,每公吨250美元，CIF大连，9月装船，不可撤销信用证付款。本月内答复有效。”乙公司于5月9日回电、“你方4月9日报盘我接受。除提供通常单据外，须提供卫生检疫证明。”甲公司未予答复。依1980年《联合国国际货物销售合同公约》，甲公司与乙公司之间的合同关系是否成立？（）
A.乙公司的回电在实质上变更了要约的条件，因此合同不成立
B.乙公司的回电未在实质上变更要约的条件,因此合同成立
C.由于乙公司提出新条件，甲公司未予答复，因此合同不成立
D.乙公司未在要约的有效时间内作出承诺,该逾期承诺原则上无效、
单项选择题
Lisa was running late．Lisa,25, had a lot to do at work, plus visitors on the way : her parents were coming in for Thanksgiving from her hometown．But as she hurried down the subway stairs, she started to feel uncomfortably warm．By the time she got to the platform,Lisa felt weak and tired--maybe it hadn't been a good idea to give blood the night before,she thought．She rested herself against a post close to the tracks．
Several yards away,Frank,43, and his girlfriend,Jennifer, found a spot close to where the front of the train would stop．They were deep in discussion about a house they were thinking of buying．
But when he heard the scream, followed by someone yelling, " Oh, my God, she fell in!" Frank didn't hesitate．He jumped down to the tracks and ran some 40 feet toward the body lying on the rails．"No!
Not you!" his girlfriend screamed after him．
She was right to be alarmed．By the time Frank reached Lisa, he could feel the tracks shaking and see the light coming．The train was about 20 seconds from the station．
It was hard to lift her．She was just out．But he managed to raise her the four feet to the platform so that bystanders could hold her by the arms and drag her away from the edge．That was where Lisa briefly regained consciousness ,felt herself being pulled along the ground,and saw someone else holding her purse．
Lisa thought she'd been robbed．A woman held her hand and a man gave his shirt to help stop the blood pouring from her head．And she tried to talk but she couldn't, and that was when she realized how much pain she was in．
Police and fire officials soon arrived, and Frank told the story to an officer．Jennifer said her boyfriend was calm on their 40-minute train ride downtown--just as he had been seconds after the rescue,which made her think about her reaction at the time． "I saw the train coming and I was thinking he was going to die," she explained．
What was the most probable cause for Lisa's weakness?
A.Shehadrunalongway
B.Shefelthotinthesubway
C.Shehaddonealotofwork
D.Shehaddonatedbloodthenightbefore
多项选择题
旅行社经营应遵循的原则有（ ）
A、自愿
B、平等
C、公平
D、诚信
E、透明
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