问题
选择题
在式子x2＋ax＋b中，当x＝2 时，其值是3 ；当x＝－3 时，其值是3 ；则当x＝1 时，其值是[ ]
(A)5
(B)3
(C) －3
(D) －1
答案
答案：D
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在式子x2＋ax＋b中，当x＝2 时，其值是3 ；当x＝－3 时，其值是3 ；则当x＝1 时，其值是[ ]
(A)5
(B)3
(C) －3
(D) －1
答案：D
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| This is Red Star Town. My grandfather has lived here all his life. He 1 my grandmother here and they got married. Red Star Town was called Taping Town before. The government started 2 the wooden houses in this area when the Red Star Town underground station was built. 3 June 2000, Taping Town has become a history. My grandfather missed many things about Taping Town. 4 in the small town knew him well. They all liked him because he used to be a good 5 in a hospital. Now he is old and stays at home. In the past, there were 6 stone and wooden houses around here. Also, there were many big trees. Now new 7 are here and there. The streets are wide and clean. There are all kinds of shops and you can buy anything 8 . My grandfather is happy that life has improved so much, 9 he still feels lonely because he really misses everything in the past. Many of his friends moved away because the government let them 10 in new apartments in new towns. The old town is still beautiful in his heart though it has disappeared (消失). | ||||
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CO2(aq) △H=-19. 75 kJ/mol，若减小二氧化碳气体在水中的溶解度，应采用的方法是[ ]