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【单选题】
蘸有浓氨水的玻璃棒和蘸有浓盐酸的玻璃棒接近时，下列现象正确的是A.
产生
B.
产生白烟
C.
产生黄绿色气体
D.
无明显现象
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反馈参考答案：
举一反三
【单选题】下列哪项不是肺动脉瓣狭窄的临床表现
A.
胸骨左缘第二肋间可触及收缩期震颤
B.
心电图示右室扩大
C.
胸骨左缘第二肋间可听到Ⅲ～Ⅳ/6级收缩期杂音
D.
X线示左室扩大，肺血多
E.
活动后心悸、气短
【单选题】3 Which of the following is true about Uncle Vernon?
A.
Uncle Vernon took Harry to King's Cross, where he could take a train to London.
B.
It was very kind of Uncle Vernon that he wheeled Harry's trunk into the station.
C.
Uncle Vernon was happy to see Harry being caught in difficulties.
D.
Uncle Vernon believed that there was platform nine and three-quarters.
【单选题】Questions 下列各 are based on the following passage. Vernon Bowman, a 75-year-old farmer from rural Indiana, did something that got him sued. Heplanted soybeans (大豆) sold as cattle feed. But Monsanto, th...
A.
He used genetically modified seeds to feed his cattle.
B.
He planted soybeans without paying for the patent.
C.
He made a profit out of Monsantos commercial secrets.
D.
He obtained Monsantos patented seeds by illegal means.
【简答题】According to the passage, can be compared to the string of a bow for both of them store energy when stretched .
【单选题】The passage uses 'a bow and arrow' as an example to show______.
A.
how an arrow gets so much energy to fly
B.
why the trap-jaw ants have springy system
C.
why the trap-jaw ants' jaws move so fast
D.
how a bow and arrow works
【多选题】根据教材[案例1-1]“不一样的课堂”回答以下问题: 小刘老师在课前使用了哪些教育技术?
A.
在线实践社区
B.
教学设计
C.
整理了丰富的学习资源
D.
自动录播系统
【单选题】下列哪一项是风湿性心脏瓣膜病主动脉瓣狭窄最主要的特征
A.
心脏显著向左下扩大
B.
周围血管征
C.
Austin-Flint杂音
D.
主动脉瓣区海鸥鸣杂音
E.
主动脉瓣区喷射性杂音．同时出现第二心音减弱或消失
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