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包扎伤口时要保持良好的（），包扎肢体时应从身体（）端到（）端，促进静脉回流。
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下例哪项不是内科疾病发生的内部因素?
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2007年1月1日，乙公司销售一批材料给甲公司，含税价为468000元。2007年7月1日，甲公司发生财务困难，无法按合同规定偿还债务，经双方协议，乙公司同意甲公司用产品抵偿该应收账款。该产品市价为：320000元，增值税税率为17%，产品成本为280000元。乙公司于2007年7月10日收到甲公司抵债的产品． 并作为库存商品入库；乙公司为债权计提了坏账准备4000元。假定不考虑其他税费。甲公司和乙公司均为一般纳税人。 要求：(1)为甲公司编制有关会计分录。 (2)为乙公司编制有关会计分录。
实验室常用乳糖操纵子控制目的基因的表达，别乳糖作为诱导剂使用，它在乳糖操纵子启动表达中的作用是（）
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 country′s strongest earthquake took place in London in 1580.（）
在离供油气区最近，溢出点最低的圈闭中，在气源充足的前提下，形成（）藏。
实际应用中如何合理地选择离心泵？