分光器至用户光缆的跳纤，余长应在不大于（）A、20cm B、30cm C、40cm

单句改错。以下句子中共有10处错误，每个句子错误数已给出，请改正。（每处1分，共10分）

小题1: Traditional moon cakes are usually made by bean paste, but nowadays, there are many different kinds of moon cakes included fruit, coffee, chocolate.(2)

小题2: There is a special food for the Dragon Boat Festival, it is called zongzi, what is sticky rice in fresh bamboo leafs. (3)

小题3: In one story, lanterns were lighted to celebrate the power of light above darkness. (2)

小题4: I sat at the table in front of fire write a letter to Father Christmas told him about all the presents we wanted.(2)

小题5:Over 2000 years ago, people were known as the Celts lived in Northern Europe. (1)

用所给动词的适当形式填空。

1. Thank you for _____ ( give ) me the picture of Li Yuchun.

2. My twin brother often _____ ( dress ) up as a cool boy.

3. May Day _____ ( come ). What are you going to do?

4. I'd like _____ ( drink ) some black tea.

5. He and I _____ ( not be ) busy now.

下列哪项是宫颈癌最可靠的诊断方法

A．宫颈管和宫颈活体组织检查

B．宫颈细胞学检查

C． * * 镜检查

D．碘试验瘢

E．宫腔镜检查

我国进行项目经济评价时往往把（）作为最主要的指标。

A.净现值

B.净年值

C.内部收益率

D.净现值率

SDH复用结构包括的基本复用单元有哪些？