高枪位操作时产生的FeO（）。A．高 B．低 C．不变

透过恩格尔系数可以反映一个国家居民的消费水平的高低。一般情况下，国家越贫困，国民购买食品支出在总支出所占的比重就越 _______，消费水平低；居民家庭生活水平越水平越高，食品支出占消费总支出中所占的比重就越 _______，消费水平比较高。 [ ]

A．小 ；大

B．大 ；小

C．小 ；小

D．大 ；大

Deng Yaping was born ____ June 2nd.1973. [ ]

A. in

B. on

C. at

D. of

完形填空。

A1ice, my frierld's daughter, goes to an expensive private school where she has a friend, Jane, who is on a full scholarship at this school. Jane has   1   economic resources-her father has been dead for years and her mother works   2   a maid. Although her mother works very hard, she can   3   support the family. Jane is very bright and gifted at   4   and that's how she has got the scholarship, which included a(n)   5   for things like lunch, school uniform and music lessons.      Alice became friends with Jane and would   6   talk to her at lunch. She did it that way in order to avoid the other kids   7   her.      On her birthday last month, she   8   her new friend to her birthday party, but Jane said she couldn't come. Alice wanted her to be   9   so much that she  10  on her coming. Eventually, the girl said, "I don't have any   11  clothes that I could wear at your birthday party." After a brief pause, the girl remembered, "I have a  12   from my piano perfomance," and asked, "Could I  13  a skirt from you?"      Alice was happy that her friend would be  14  to come and hurried home to ask her Mum  15  she could lend her friend one of her skirts. To her surprise, her Mum said, "No." The daughter was very  16  and angrily said to her Mum, " 17  I could, I would give my friend all my clothes." The Mother didn't understand why her daughter should have had such an outburst as she's normally very well  18 .      Fimlly, Alice explained to her Mother her friend's  19 . Her Mother immediately changed her mind and said, "Yes." She also encouraged her daughter not to feel like she should secretly be friends with Jane but to feel proud of her  20  with her.      So the true friendship seeks to give, not to take; to help, not to be helped; to minister, not to be ministered unto.

( )1.A. personal     ( )2.A. for         ( )3.A. hopefully    ( )4.A. music        ( )5.A. bonus        ( )6.A. secretly     ( )7.A. pointing at  ( )8.A. took         ( )9.A. happy        ( )10.A. depended     ( )11.A. casual       ( )12.A. shirt        ( )13.A. get          ( )14.A. free         ( )15.A. how         ( )16.A. stubborn     ( )17.A. If           ( )18.A. treated      ( )19.A. cleverness   ( )20.A. study        B. extra        B. with          B. obviously    B. drawing       B. allowance    B. happily      B. shouting at  B. invited      B. independent   B. insisted      B. comfortable     B. jeans         B. copy          B. able         B. when          B. upset         B. When         B. controlled   B. character     B. friendship    C. limited       C. like          C. hardly       C. maths        C. donation     C. quietly      C. laughing at  C. accompanied   C. confident     C. focused      C. nice         C. handbag      C. order        C. glad          C. why          C. firm          C. Unless        C. educated      C. circumstances   C. sympathy     D. adequate       D. as             D. temporarily     D. biology        D. pension        D. eagerly        D. glaring at         D. sent           D. present        D. agreed         D. tight          D. necklace       D. borrow         D. willing        D. whether        D. enthusiastic   D. Though         D. behaved        D. competences     D. performance

(二)

背景资料

某机械设备安装工程项目，业主拟通过招标确定施工承包商，经过资格预审确定了A、B、C、D、E、F六家投标人作为潜在投标人，这六家潜在投标人在投标时出现以下情况。
A投标人在编制投标文件时主要依据设计图纸、工程量表、其他投标人的投标书、有关法律法规等。
B投标人在编制投标文件时，首先确定了上级企业管理费及工程风险和利润，接着开始计算工料及单价。
C投标人在编制施工方案时，主要从工程量要求、技术要求、施工设备要求、施工利润要求、质量要求等五个方面综合考虑。
D投标人的投标文件按照招标文件的各项要求编制后，另外附加了工期需延长10天的条件。
E投标人在投标截止时间前递交了一份补充文件，提高了投标报价。
F投标人的投标组织机构由本单位的经营管理人员和专业技术人员组成。

问题

B投标人在编制投标文件时的步骤是否恰当如不恰当，请改正。

带压不置换动火，就是严格控制含氧量，使（）的浓度大大超过爆炸上限，然后让它以稳定的速度，从管道口向外喷出，并点燃燃烧

A.可燃气体

B.不可燃气体

C.惰性气体

D.有毒气体