如图甲所示，水平放置的U形金属导轨宽度为25cm，其电阻不计。阻值为2Ω的金属棒

冶炼高碳钢12/5217炉次，装入铁水57.1吨，废钢7.6吨，钢水量58.0吨，计算出：这炉钢吹损为多少？（铁水按0.8%扣渣）.

第二节完形填空（20小题；每小题1.5分，满分30分）

Many people wrongly believe that when people reach old age, their families place them in nursing homes. They think that they are left in the (36)       of strangers for the rest of their lives. Their (37)     children visit them only occasionally, but more often, they do not have any (38)      visitors. They live a lonely life without anyone’s care. The truth is that this idea is an unfortunate myth and (39)     story. In fact, family members provide over 80 percent of such care (40)     elderly people need. They are still living in a familiar family. Samuel Prestoon, a sociologist, studied (41)      the American family is changing. He reported that by the time the (42)      American couple reaches 40 years of age, they have more parents than children. However, because people today live longer after an illness than people did years (43)      , family members must provide long term care. We know, people need company, (44)     the elderly people.

More psychologists have found that all caregivers (45)   a common characteristic: All caregivers believe that they are the best (46)     for the job. In other words, they all felt that they (47)     do the job better than anyone else. They will do the job heart and soul. A survey was carried out between the caregivers. Social workers (48)      caregivers to find out why they took (49)    the responsibility of caring for an elderly relative. Many caregivers believed they had (50)      to help their relative. Some (51)      that helping others make them feel more useful and full. Others hoped that by helping (52)      now, they would (53)      care when they became old and (54)      .Caring for the elderly and being taken care of can be a mutually satisfying experience for everyone who might be (55)      .

36. A. charges          B. cares               C. homes                 D. hands

37.A.growing           B. grown                C. developed             D. developing

38 A. regular            B. constant               C. usual               D. close

39.A.true               B. false                  C. imaginary           D. sad

40.A.this               B. that                   C. what                D. as

41.A.how                     B. when                  C. why                D. what

42.A.usual              B. general               C. average              D. most

43.A.later                     B. ago                   C. before              D. since

44.A.let alone           B. leave alone           C. let out               D. leave behind

45.A.share              B. form                 C. appreciate            D. value

46.A.men               B. somebody             C. people               D. person

47.A.would              B. should               C. might                D. could

48.A. questioned         B. interviewed           C. asked                  D. inquired

49.A.up                 B. in                   C. on                 D. off

50.A.intention           B. admiration            C. duty                  D. admission

51.A.declared            B. stated                C. showed              D. complained

52.A.anyone            B. everyone             C. none                D. someone

53.A.earn                B. deserve               C. devote               D. increase

54.A.unsatisfied          B. dependent             C. lonely                  D. unlucky

55.A.thought            B. considered            C. cared                D .involved

钢球磨煤机电流（），排粉机电流（），系统负压（），说明磨煤机煤量过多或堵煤。

下述有关内分泌调节机制中错误的是

A．促甲状腺激素分泌增多时，甲状腺激素分泌增多
B．甲状腺激素分泌增多时，促甲状腺激素分泌减少
C．促甲状腺激素分泌减少时，甲状腺激素分泌减少
D．甲状腺激素分泌减少时，促甲状腺激素分泌减少
E．甲状腺激素分泌减少时，促甲状腺激素释放激素减少

使环丙沙星中枢毒性增加的是（）

A、茶碱

B、铁盐

C、口服抗酸剂

D、非甾体抗炎药

E、磺胺药