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【单选题】
?Read the article below about job market. ?Choose the correct word or phrase to fill each gap from A, B, C, or D. ?For each question 21—30, mark one letter (A, B, C, or D) on your Answer Sheet. In just eight years, by 2010, there will be 58 million jobs in the United States, D the Bureau of Labor Statistics. The bureau (21) between now and 2010 some 22 million new jobs will be created. And 36 million more (22) will result from retirements and others who drop out of the workforce. Nearly all that job (23) , incidentally, will come in the service sector. Manufacturing jobs will grow at only (24) of a percent annually. That's not because those jobs are going overseas, by the way. Blame the slow growth in manufacturing (25) the fast growth in manufacturing productivity. Ed Potter, president of the Employment Policy Foundations in Washington, said the foundation's analysis of job growth and wharfs (26) happening in education show there could be as (27) as 3.5 million professionals at the end of this decade. Despite the current recession and layoffs, a (28) of employers by the National Association of Manufacturers found 80 percent of companies say a severe shortage of qualified job (29) already exists. And 60 percent of those companies said the lack of skilled workers is (30) their ability to produce. (21)
A.
persists
B.
predicts
C.
distinguishes
D.
extinguishes
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【单选题】一台三相电力变压器 s ‍ n =560kVA , U ‍ 1 N \ U ‍ 2 N =10000/400V, Dy 接法,负载时忽略励磁电流,低压边相电流为 808.3A 时,则高压边的相电流为 。
A.
808.3A
B.
56A
C.
18.67A
D.
32.33A
【单选题】一台三相电力变压器 S N ‍ =560kVA , U 1 N ‍ / U 2 N ‍ =10000/400V, Dy 接法,负载时忽略励磁电流,低压边相电流为 808.3A 时,则高压边的相电流为 。
A.
808.3A
B.
56A
C.
18.67A
D.
160
【单选题】急性阈剂量 (Limac) 为与化学物质( )接触所得
A.
一次
B.
二次
C.
三次
D.
D . 小剂量反复多次
【单选题】供电调度员对1个牵引变电所1次只能下达()个倒闸作业命令。
A.
1
B.
2
C.
3
【简答题】供电调度员对1个牵引变电所1次只能下达()个倒闸作业命令,即1个命之前,不得()。
【判断题】注意是一种心理过程
A.
正确
B.
错误
【简答题】对于抛物线y 2 =2px(p>0),F为其焦点,过点F的直线l与抛物线交于A(x 1 ,y 1 )、B(x 2 ,y 2 )两点. (1)求弦AB的长(用x 1 、x 2 、p表示); (2)当AB⊥x轴时,求AB的长; (3)判断以AB为直径的圆与抛物线的准线l的位置关系.
【简答题】一家企业供给弹性为 0.5 ,需求弹性为 1.5 ,当前价格为 40 元 / 吨,交易量 1200 吨 / 星期。 (1) 在当前价格和交易量下,建立线性供给和需求曲线 (2) 如果需求增加 600 吨,对均衡价格和数量有什么影响?
【简答题】供电调度员对1个牵引变电所1次只能下达 _____个倒闸作业命令。
【简答题】在显示器上显示如图所示的一个菜单程序的模型。 要求:在用户输入选项后,不用实现具体功能,给出提示信息即可。各选项对应的提示信息如下: 选项1:“请输入新联系人的信息:” 选项2: "所有联系人信息如下:" 选项3:“请输入待查询联系人姓名:" 选项4: "请输入待删除联系人姓名:" 效果如图所示:
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