射流泵由那些部分组成？（）A.喷嘴 B.叶轮 C.吸入室 D.混合管 E.扩

已知x²-2kx+1是完全平方式，则k的值为______．

化工产品纯碱中常含有NaCl，某研究性学习小组为了测定纯碱中Na₂CO₃的质量分数，称取含NaCl的

Na₂CO₃固体样品11．4g，再向其中逐滴加入适量的93g的稀盐酸，恰好完全反应，使气体全部放出，共收集到4．4gCO₂气体。

（1）计算此纯碱样品中Na₂CO₃的质量。

（2）求反应后溶液中溶质的质量分数。

第二节：完形填空(共 20 小题；每小题 1 分，满分 20 分)

阅读下面短文、掌握其大意、然后从 36~55 各题所给的四个选项(A、B、C 和 D)中，

选出最佳选项、并在答题卡上将该项涂黑。

Once, it was in the middle of a personal development workshop. One of the people present stood up and began   36   out diamond rings to each of the one hundred people in the room.

He was a   37   jeweler, he said, and he had made these expensive   38   as gifts to open people’s eyes to the abundance(富裕) of life.

On his fifth birthday, the man   39  , his uncle had taken him to a candy (糖果)   40   and told him that he could take   41   he wanted, and as much as he wanted.   42   he was very pleased and decided to   43   something he liked best.

The entire store was   44   to him. He had looked at the jars and plates, and he hadn’t known where to   45  . At last, he filled a bag with all his   46   candies. He didn’t take everything,   47   that feeling of being able to have whatever he wanted seemed to make him very   48  .

Since then, he said, he had been able to   49   the abundance of life. He saw the world as full of   50  , riches and beauty — all you had to do was, take your pick and fill your bag.

The sad truth is that most of us grow up with the   51   feeling —we develop a poverty mentality(贫穷心理). We   52   believe that there simply isn’t enough. We think we have to   53  , fight and struggle, so that we can get what we need and want. If we can’t   54  our hands to get,  someone else will be searching through our pockets. The   55   of that mentality is that we all have to go hungry.

Get a taste of abundance and try to have a great life.

36. A. giving                B. lending                    C. showing                   D. borrowing

37. A. poor                   B. strong                      C. rich                         D. popular

38. A. necklaces            B. watches                    C. medals                            D. rings

39. A. complained         B. explained                 C. suggested                 D. expected

40. A. school                B. factory                            C. store                        D. yard

41. A. whatever             B. wherever                  C. whichever                D. whomever

42. A. Unfortunately      B. Sadly                       C. Silently                    D. Certainly

43. A. refuse                B. accept                      C. choose                            D. change

44. A. small                 B. open                        C. empty                      D. closed

45. A. begin                  B. work                        C. stay                         D. end

46. A. cheap                 B. famous                    C. expensive                 D. favourite

47. A. and                    B. or                            C. but                          D. nor

48. A. worried                     B. excited                     C. interested                 D. surprised

49. A. search                 B. invent                      C. lose                         D. notice

50. A. opportunities              B. troubles                    C. sorrows                    D. quarrels

51. A. boring                B. normal                            C. opposite                   D. natural

52. A. hardly                B. always                            C. never                       D. less

53. A. leave                  B. continue                   C. stop                         D. compete

54. A. reach out            B. put up                      C. take back                  D. work with

55. A. promise                     B. result                       C. success                     D. hope

IgA降低的是

A．反复呼吸道感染

B．湿疹

C．类风湿性关节炎

D．肾脏疾病

E．SLE

( )是可以用产值工资率指标考核人工费的支出水平的方法。

A．相关比率法

B．构成比率法

C．动态比率法

D．静态比率法