问题
判断题
金融远期合约由于采用了“集中交易”的方式，交易事项可协商确定，较为灵活，金融机构或大型工商企业通常利用远期交易作为风险管理手段。( )
答案
参考答案：错
解析： 金融远期合约由于采用了“一对一交易”的方式，交易事项可协商确定，较为灵活，金融机构或大型工商企业通常利用远期交易作为风险管理手段。
搜题请搜索小程序“爱下问搜题”
金融远期合约由于采用了“集中交易”的方式，交易事项可协商确定，较为灵活，金融机构或大型工商企业通常利用远期交易作为风险管理手段。( )
参考答案：错
解析： 金融远期合约由于采用了“一对一交易”的方式，交易事项可协商确定，较为灵活，金融机构或大型工商企业通常利用远期交易作为风险管理手段。
细菌冶金是一种新工艺，其能耗少、减少环境污染．称为“绿色冶金”。其原理：①氧化硫硫杆菌和聚硫杆菌能把矿石中的硫氧化成硫酸，反应式为2S+3O2+2H2O 2H2SO4，②氧化亚铁硫杆菌在上面产生的硫酸中能把硫酸亚铁氧化成硫酸铁③细菌得到了所需要的能量，生成的硫酸铁可把FeS2（黄铁矿）和Cu2S（辉铜矿）等转变为可溶性化合物而从矿石中溶解出来，其化学过程是：
Fe2S2（黄铁矿）+7Fe2(SO4)3+8H2O 15FeSO4+ 8H2SO4
Cu2S（辉铜矿）+2Fe2(SO4)2 2CuSO4+4FeSO4+S
（1）写出②反应的化学方程式： 。
（2）某实验小组，欲将硫酸铜和硫酸亚铁的酸性混合液分离出硫酸亚铁溶液．经查阅资料得知，在溶液中通过调节溶液的酸碱性而使Cu2+、Fe2+、Fe3+分别生成沉淀的pH如表2
| 物质 | Cu（OH）2 | Fe（OH）2 | Fe（OH）3 |
| 开始沉淀pH | 6.0 | 7.5 | 1.4 |
| 沉淀完全pH | 13 | 14 | 3.7 |
实验经过滤后还需设计的实验操作步骤和目的是：
| 实验步骤 | 实验操作 | 实验操作的目的 |
| 步骤1 | ||
| 步骤2 | ||
| 步骤3] | ||
| 步骤4 | 洗涤 | |
| 步骤5 | 得到FeSO4溶液 |
。该学生的计算是否正确： ，请说明理由 。
Sandra Cisneros was born in Chicago in 1954 to a Mexican American family. As the only girl in a family of seven children, she often felt like she had “seven fathers,” because her six brothers, as well as her father, tried to control her. Feeling shy and unimportant, she retreated(躲避) into books. Despite her love of reading, she did not do well in elementary school because she was too shy to participate. In high school, with the encouragement of one particular teacher, Cisneros improved her grades and worked for the school literary magazine. Her father encouraged her to go to college because her thought it would be a good way for her to find a husband. Cisneros did attend college, but instead of searching for a husband, she found a teacher who helped her join the famous graduate writing program at the University of Iowa. At the university’s Writers’ Workshop, however, she felt lonely----a Mexican American from a poor neighborhood among students from wealthy families. The feeling of being so different helped Cisneros find her “Creative voice.” “It was not until this moment when I considered myself truly different that my writing acquired a voice. I knew I was a Mexican woman, but I didn’t think it had anything to do with why I felt so much imbalance in my life, but it had everything to do with it! That’s when I decided I would write about something my classmates couldn’t write about.” Cisneros published her first work, The House on Mango Street, when she was twenty-nine. The book tells about a young Mexican American girl growing up in a Spanish-speaking area in Chicago, much like the neighborhoods in which Cisneros lived as a child. The book won an award in 1985 and has been used in classes from high school through graduate school level. Since then, Cisneros has published several books of poetry, a children’s book, and a short-story collection. 小题1:Which of the following is TRUE about Cisneros in her childhood?
|