问题
选择题
| 向一定体积的Ba（OH）2溶液中逐滴加入稀硫酸，溶液的导电性（以电流I表示）滴入的稀硫酸的体积（用V表示）间的关系最接近真实情况的是（ ） A． B． C． D． |
答案
答案：A
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| 向一定体积的Ba（OH）2溶液中逐滴加入稀硫酸，溶液的导电性（以电流I表示）滴入的稀硫酸的体积（用V表示）间的关系最接近真实情况的是（ ） A． B． C． D． |
答案：A
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| Two teenagers who were lost at sea off the United States for six days were saved yesterday. Driscoll,15,and his best friend,18－year－old Josh Long,were_1_on Saturday about 11 km off Cape Fear in North Carolina.That was six days and more than 100 miles (161 km) from where they had_2_from Sullivan's Island,South Carolina,on April 24. The boys had_3_a lot of water and were tired,but in pretty_4_shape. They set out_5_on a 4.3－metre sailboat on a_6_day when the National Weather Service had warned small boats to stay out of the water.They_7_they were in trouble almost_8_and tried to swim bac  k to the shore,_9_the boat along with them.Within 10 ,they were far out at sea. "We lost our fishing equipment on the second day,"Driscoll said."So we couldn't 11 any fish." The boys' hopes 12 with each day.They stood on their boat 13 they saw another boat, 14 and shouting.One night they were woken up by 15 coming into the boat.A large ship was very close to them. "It was like some huge 16 in the water,"Driscoll said. At one point,the boys thought they had gone across the Atlantic Ocean and were close to Africa. 17 , they were 179 km north of their 18 point.A coast guard boat set out to look for them. The boys got up and made some 19 .This time,they were heard. "What we have is a completely surprising story of 20 that's going to be studied for years to come," said Richard Goerling,Long's uncle."I think the boys have a book to write." | ||||
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