强度等级≤C30混凝土气温不高于25℃的运输浇筑及间隙的全部允许时间为 ( )。A

题型:单项选择题

问题:

强度等级≤C30混凝土气温不高于25℃的运输浇筑及间隙的全部允许时间为 ( )。

A.

210min

B.

180min

C.

150min

考点:公路工程监理工程师工程系列(道路与桥梁)道路与桥梁
题型:单项选择题

“We do look very different; we’re older. Leo’s 38, I’m 37. We were 21 and 22 when we made that film. You know, he’s fatter now -- I’m thinner.” So says Kate Winslet, who is thrilled at the 3-D re-release of Titanic to coincide with the 100th anniversary of the ship’s demise. “It happens every time I get on any boat of any kind." She recalls. There are all the people who want her to walk to the front of the ship and re-create her famous pose, arms flung wide. Most people remember the tragedy: The British passenger ship—said to be unsinkable—hit an iceberg and sank on April 15, 1912, during its maiden voyage from England to New York City. More than 1,500 people died. But little known is what the world learned from the sinking to prevent future incidents.

Probably the greatest deficiency (不足) of the Titanic was that she was built 40 years before the widespread use of the wonderful invention radar (雷达). Her only defense against icebergs and hidden obstacles was to rely on manned lookouts. On that fateful night the eyesight of trained lookouts only provided 37 seconds of warning before the collision.

Traveling at nearly 30 miles an hour, the Titanic was moving far too fast to avoid the huge iceberg. The warning did prevent a head-on collision as the officer on the bridge managed to turn the ship slightly.

The last ship to which it could send an SOS message was the California. She was within ten miles of the Titanic during the disaster, but her radio operator went to bed at midnight and never received any of the SOS messages from the Titanic. That was one of the important lessons learned from the catastrophe, the need for 24-hour radio operators on all passenger liners.

Another lesson learned was the need for more lifeboats. The Titanic remained afloat (漂浮) for almost three hours and most of the passengers could have been saved with enough lifeboats.

1,500 passengers and workers died in the 28 degree waters of the Atlantic. Out of the tragedy, the sinking did produce some important maritime reforms. The winter travel routes were changed to the south and the Coast Guard began to keep an eye on the location of all icebergs. The new rules for lifeboats were obvious to all. There must be enough lifeboats for everybody on board.

The most important lesson learned was that no one would ever again consider a ship unsinkable—no matter how large or how well constructed. Never again would sailors place their faith in a ship above the power of the sea.

小题1:The text mainly tells us ______.

A.the reason why the Titanic sank in the Atlantic Ocean

B.how the unsinkable ship of Titanic sank in the Atlantic Ocean

C.the lessons that we could learn from the accident of the Titanic

D.the things we should do to protect the lives on the ship小题2:According to the passage, which of the following could we infer?

A.If the captain had been more careful, he could have had the chance to save the Titanic.

B.If radar had existed 40 years ago, the Titanic would have never disappeared from the world.

C.If the lookout had had much more experience, he could have had the time to save the Titanic.

D.If there had been enough lifeboats on the Titanic, the Titanic would not have sunk in the Atlantic.小题3:What would be the best title for the passage?

A.Lessons from the Titanic

B.Technology is Important

C.Demands of Passengers

D.Power of Sea小题4:What’s the sailors’ attitude towards the ships after the tragedy?

A.They think there really exists the unsinkable ship.

B.They think ships could eventually defeat the sea.

C.They think there is no power that could control the sea.

D.They think the bigger the ship is, the safer it is.

题型:单项选择题

属于高危妊娠的是()

A.35岁以上的初产妇

B.有异常胎位

C.多年不孕治疗后妊娠

D.有难产史

E.多产史

题型:单项选择题

以下九道小题使用的数据表如下:当前盘当前目录下有数据库:大奖赛 dbc,其中有数据库表“歌手 dbf”、“评分 dbf”“歌手”表:

删除视图 myview 的命令是________。

A.DELETE myview VIEW

B.DELETE myview

C.DROP myview VIEW

D.DROP VIEW myview

题型:单项选择题

在整个管理系统和管理过程中,要把()作为管理的根本目的和最终归宿。

题型:单项选择题

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