起重机具均应经试验合格后方可使用，并按铭牌标明的允许工作荷重使用，不得（）。使用车辆

下图展示的是台北101大楼为呼应“物理照亮世界”的活动，点亮灯光，凸现“E= mc2”，纪念伟大的科学家爱因斯坦发表相对论一百周年的场景。相对论提出的历史意义有

①是物理学领域的一次重大革命 ②否定了经典力学的绝对时空论

③深刻地揭示了时间和空间的本质属性④树立了新的时空观、运动观、物质观

A．①②③

B．①②③④

C．①③④

D．①②④

Do you know how to write an English letter? It is different from the Chinese letter. When we write a letter in English, we should write the date on the top of the right corner. Sometimes we write the insideaddress(信内地址)---the number of the house and the names of the street, city and country. Then we can begin the letter at the left corner. We always use words like “Dear sir”, “Dear Mr/Miss/Mrs …”to begin the writing. At the end of the letter, we usually use expressions as “Yours”, “Yours ever” or “Yours sincerely”. Then sign the writer’s name.

It is also different to write an English envelope. You should write your name and address on the top of the left corner and write the receiver’s in the middle or on the bottom of the right corner.

小题1:When we write a letter in English, we should write the date _______.

A．At the beginning of the letter

B．at the left corner

C．on the top of the right corner

D．at the end of the letter小题2:The inside address includes _______.

A．The number of the house

B．the name of the street

C．the name of the city and country

D．all of the above小题3:We always use words like “__________ ” to begin the writing.

A．Dear sir

B．Dear Mr/Miss/Mrs

C．Your sincerely

D．A and B小题4:Which of the following is TRUE according to the passage?

A．The English letter is the same as the Chinese letter.

B．You can write your name and address on the top of the left corner.

C．Writing an English envelope is the same as writing a Chinese envelope.

D．We can begin the letter at the right corner.小题5:What’s the best title for the passage?

A．How to write English letters

B．How to write Chinese letters

C．Writing letters and sending emails

D．The advantage of writing letters

对于铝热反应：Fe₂O₃ + 2Al  2Fe + Al₂O₃，下列说法中正确的是（    ）

A．Fe元素的化合价升高

B．若27 g Al参加反应则有3 mol电子转移

C．Fe₂O₃发生氧化反应

D．Al被还原

中药由于贮藏或加工处理不当等，会产生一种特殊的令人不快的气味，通常称为

A．酸败

B．泛油

C．走油

D．变质

E．潮解

痉挛性脑瘫患者多表现为（）

A.画圈步态

B.慌张步态

C.鸭步步态

D.剪刀步态

E.足下垂步态