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PLS为上升沿脉冲指令，PLF为下降沿脉冲指令，皆输出一个（）的脉冲信号。
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提升自我效能的六项选择？
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公共政策终结中的分解指的是将旧的公共政策的内容按照一定的规则分成几个部分，每一部分各自形成一项新公共政策。()A.错误B.正确
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当道口发生故障时，使用对讲机通知机车乘务员的标准用语是什么？
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1905年，《申报》宣布要“别刊大字、择要标题”，这在新闻标题发展中意味着（）。
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Moderate Earthquake Strikes England A moderate earthquake struck parts of southeast England on 28 April 2007, toppling chimneys from houses and rousing residents from their beds. Several thousand people were left without power in Kent County. One woman suffered minor head and neck injuries. "It felt as if the whole house was being slid across like a fun-fair ride," said the woman. The British Geological Survey said the 4. 3-magnitude quake struck at 8:19 a.m. and was centered under the English Channel, about 8.5 miles south of Dover and near the entrance to the Channel Tunnel. Witnesses said cracks appeared in walls and chimneys collapsed across the county. Residents said the tremor had lasted for about 10 to 15 seconds. "I was lying in bed and it felt as if someone had just got up from bed next to me." said Hendrick van Eck, 27, of Canterbury about 60 miles southeast of London. "I then heard the sound of cracking, and it was getting heavier and heavier. It felt as if someone was at the end of my bed hopping up and down." There are thousands of moderate quakes on this scale around the world each year, but they are rare in Britain. The April 28 quake was the strongest in Britain since 2002 when a 4.8-magnitude quake struck the central England city of Birmingham. The country's strongest earthquake took place in the North Sea in 1931, measuring 6.1 on the Richter scale. British Geological Survey scientist Roger Musson said the quake took place on 28 April in an area that had seen several of the biggest earthquakes ever to strike Britain, including one in 1580 that caused damage in London and was felt in France. Musson predicted that it was only a matter of time before another earthquake struck this part of England. However, people should not be scared too much by this prediction, Musson said, as the modern earthquake warning system of Britain should be able to detect a forthcoming quake and announce it several hours before it takes place. This would allow time for people to evacuate and reduce damage to the minimum. The April 28 quake was stronger than the one of 2002.（）
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我国电子商务法律体系存在的问题有哪些？
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全面推行线损管理责任制属于管理降损的措施。()
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判断幽门螺杆菌（Hp）是否根除，应除外的临床检验方法是（）。
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滥用职权罪的犯罪的主观方面必须是（）。