关于干细胞研究和应用的伦理原则，错误的是A．尊重胚胎的原则 B．禁止一切形式的商业活

能补偿轴的综合位移的联轴器为（）联轴器。

A.凸缘式 

B.夹壳式 

C.套筒式 

D.齿轮式

某建设项目建设期为3年，计划总投资额为5400万元，均衡投入，年均投资额上涨率为3%，则该项目建设期的涨价预备费为()万元。

A.54

B.109.62

C.166.91

D.330.53

Directions: Read the following passage. Fill in the numbered blanks by using the information from the passage.

Write NO MORE THAN THREE WORDS for each answer.

     An apprenticeship is a form of on-the-job training that combines workplace experience and classroom

learning. It can last anywhere from one to six years, but four years is typical for most. An apprentice spends

the majority of the time in a workplace environment learning the practical skills of a career from a journeyman-

someone who has done the job for many years. The rest of the apprentice's time is spent in a classroom

environment learning the theoretical skills the career requires. Being an apprentice is a full-time undertaking.

     One of the advantages of apprenticeship is that it does not cost apprentices anything. The companies that

hire them pay for school. What's more, it offers apprentices an "earn while you learn" opportunity. They usually

start out at half the pay of a journeyman, and the pay increases gradually as they move further along in the job

and studies. Near the end of the apprenticeship, their wages are usually 90 percent of what a journeyman would

receive. Apprenticeship also pays off for employers. It can offer employers a pool of well-trained workers to

draw from.

     Despite the advantages, apprentices are usually required to work during the day and attend classes at night,

which leaves little time for anything else. Sometimes, they might be laid off (下岗) if business for the employers

is slow.

     Once they have completed the apprenticeship and become journeymen, they receive a nationally recognized

and portable certification and their pay also increases again. Some journeymen continue employment with the

companies they apprenticed with; others go onto different companies or become self-employed contractors.

1______2______3______4______5______

6______7______8______9______10______

下列选项中，不属于西汉农业发展状况的是（）

A．代田法的推广

B.白渠的开凿

C.王景治黄河

D．耧播技术的推广

对于邀请招标来说，投标单位的资格审查在（）时进行。

A.签订合同

B.递交投标文件

C.资格预审

D.评标