3A的直流电通过电阻R时,t时间内产生的热量为Q;现让一交流电通过电阻R,若2t

题型:选择题

问题:

3A的直流电通过电阻R时,t时间内产生的热量为Q;现让一交流电通过电阻R,若2t时间内产生的热量为Q,则该交流电流的有效值和最大值分别为(  )

A.I=3/2A,Im=3A

B.I有=3A,I=3A

C.I有= A,I A

D.I3A,Im=6A

考点:交变电流的周期和频率
题型:选择题

对直径小于3cm的肝癌,具有定位价值的检查方法首选

A.同位素肝扫描

B.血清甲胎蛋白测定

C.血清碱性磷酸酶测定

D.经皮肝穿刺胆道造影

E.超声波检查

题型:选择题

The Museum: The Charles Dickens Museum in London is the world's most important collection of material relating to the great Victorian novelist and social commentator.The only surviving London home of Dickens (from 1837 until 1839) was opened as a museum in 1925 and is still welcoming visitors from all over the world.On four floors, visitors can see paintings, rare editions, manuscripts, original furniture and many items relating to the life of one of the most popular and beloved personalities of the Victorian age.       

Opening Hours

◇ The Museum is open from Mondays to Saturdays 10:00-17:00; Sundays 11:00-17:00.

◇ Last admission is 30 minutes before closing time.

◇Special opening times can be arranged for groups, who may wish to book a private view.

Admission Charges: Adults: £5.00; Students: £4:00; Seniors: £4.00; Children: £3.00; Families:£14.00( 2 adults & up to five children)

Group Rates: For a group of 10 or more, a special group rate of £4.00 each applies.

Children will still be admitted for £3.00 each,

Access: We are constantly working to improve access to the Museum and its collection.Our current projects involve the fitting of a wheelchair ramp for better access, a customer care kit and an audio tour for visitors with impaired (受损的) vision.Our Handling Sessions are also suitable for the visually impaired.The Museum has developed an online virtual tour through the Museum.Click here to visit all the rooms in the Museum online.

Hire the Museum: The Museum can be hired for private functions, performances soirees(社交晚会) and many other social occasions.

Find Us: The Museum may be reached by using the following buses: 7, 17, 19, 38, 45,46, 55, 243.And by these underground services: Piccadilly Line; Central Line.For a map, please click here.The British Museum and the Foundling Museum are within walking distance.

小题1:The passage is probably from a(n)         .

A.book

B.website

C.newspaper

D.announcement小题2:Compared to going there separately, if a family with two adults and five children go to the Museum together they will save

A.£25.00

B.£14.00

C.£ 9:00

D.£11.00小题3:In the Charles Dickens Museum, people can not find          .

A.paintings

B.rare editions

C.manuscripts

D.cars小题4:According to the passage, which of the following statements is TRUE?

A.The Museum is not very far from the British Museum.

B.In any case people cannot visit the Museum after 17:00.

C.Visitors with poor vision cannot enjoy the Museum.

D.Anyone cannot hire the Museum for other users.小题5:The passage is written to         .

A.persuade readers to visit London.

B.inform readers about the history of the Charles Dickens Museum.

C.offer readers some information about the Charles Dickens Museum.

D.tell readers how to make use of the Charles Dickens Museum.

题型:选择题

抗体分子中与抗原结合的部位是()。

A.重链的V区

B.轻链的V区

C.重链和轻链的V区

D.重链和轻链的C区

E.重链的V区和轻链的C区

题型:选择题

女,4岁。摔倒后肩部疼痛,检查患肩下沉,患肢活动障碍,头向患侧偏斜,杜加(Dugas)征阴性,最可能的诊断()

A.肩关节脱位

B.臂丛神经损伤

C.锁骨骨折

D.肱骨外科颈骨折

E.桡骨小头半脱位

题型:选择题

电火花能用于尺寸加工,需要具有哪些条件?

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