受电弓平衡杆的作用是控制（）。A、最大工作高度 B、运动轨迹 C、受电弓滑板保持水平

Canberra is the capital of Australia.It is a modern and lively city with a population of over 345.000.

History

Canberra is the eighth largest city in Australia.It is 238 km from Sydney and 507 km from Melbourne was once the capital of Austualia. Sydney people also wished to make their city the capital .It was difficult for the government to make the decision.Then in 1911,the government chose a place to build the new capital. It was between Sydney and Melbourne，the two largest cities .In 1927，the city was set up. It became the capital and was named Canberra.“Canberra”means“ a place for friends to get together.”

Cuture

Canberra is a beautiful city with trees and flowers everywhere.There’s a Flower Festival in September each year. People can enjoy all kinds of beautiful flowers and welcome the spring to arrive.A man-made like-lake. Bertey Griffin is in the center of the city.It’s about 25 km long. People like to ride bikes 、walk or run around the lake.In Canberra，there’re many famous universities like the Australian  National University and the University of Canberra.The National Library and the National Meseum of

Australia are also famous places that people like to visit.

小题1:How far is Canberra from Sydney?

A．25km

B．238km

C．345 km

D．507 km小题2:The word “Canberra”means__.

A．the largest city

B．a beautiful man—made lake

C．the old capital city

D．a place for friends to get together小题3:Canberra Flower Festival is a festival __.

A．ride lakes

B．visit Universities

C．welcome the spring

D．walk around the lake

金钱草的常见伪品为（）

A．霞草

B．风寒草

C．人参

D．参薯

E．桃儿七

（）是沿泥凝土裂缝凿一条深糟内嵌填各种防水材料，如环氧砂浆及预缩砂浆、沥青砂浆等，以防渗水。

A、表面涂抹修补

B、凿槽嵌补

C、挤压修补

D、预应力修补

用受热膨胀的刻度尺测量，测量结果是：[ ]

A．偏大

B．偏小

C．不受影响

D．都有可能

滴定管未经校正，属于（）。

A、操作误差

B、偶然误差

C、系统误差

D、方法误差