阅读理解。
Greenland is the largest island in the world. It covers over 2 ,000,000 square kilometers. Most of
the island lies inside the Arctic Circle (北极圈), and a huge sheet (片) of Ice covers 85% of its area.
Along the sea mountains rise from the sea. There are a few low trees in the southwest, but no forests.
In winter snow covers everything, but in summer very low plants cover the ground between the sea and
the Ice sheet. Norwegians (挪威) were the first Europeans to see the island in AD 875, but no one
visited it until 982. Three years later a few Norwegians went to live there. In 1261 the people in Greenland decided to join Norway. Norway and Denmark united in 1380. This union ended in 1814, and Greenland
stayed with Denmark. Greenland is fifty times larger than Denmark, but it is still part of this small country.
1. When you study a map of the world, you may notice that Greenland _____.
A. is the greatest country in Europe
B. lies just on top of Europe
C. is connected with Denmark and Norway
D. mostly lies within the Arctic Circle
2. What will you probably see when you come to the southwest of Greenland in summer?
A. Forests of very low trees.
B. Nothing but ice sheet everywhere.
C. Very low plants along the seaside.
D. Snow that covers everything there.
3. When did Europeans begin to live in Greenland?
A. In AD 875.
B. In AD 982.
C. In AD 1261.
D. In AD 985.
4. How long did Greenland stay with Norway?
A. About 120 years.
B. About 400 years.
C. About 550 years.
D. About 500 years.
5. Which of the following is NOT right?
A. Greenland now belongs to Denmark.
B. Norway and Denmark have been one countrysince 1380.
C. Norway and Demnark didn't unite until 1380.
D. The area of Denmark is one-fifty-first of that of Greenland.
，as=110mm时，试问，开裂截面的换算截面惯性矩Icr(×106mm4)，假定Icr=50000×106mm4，x0=290mm，施工吊装时，T形梁最下一层纵向受力钢筋的应力
，与下列何项数值最为接近