算式671+29×4÷2中,应先算乘法,再算除法,最后算加法.______.(判

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问题:

算式671+29×4÷2中,应先算乘法,再算除法,最后算加法.______.(判断对错 )

考点:整数的四则混合运算及应用题
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简述经验曲线和规模经济的区别?

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Air travel chaos across Europe caused by the volcanic eruption in Iceland continued Sunday, impacting tourists and business people's schedules and causing economic loss to Chinese airlines and tourism agencies.

Air China canceled five one-way flights and eight return flights to European cities including Paris, Frankfurt and Moscow Sunday, according to a notice on its website. "The cancellation was due to closure of most European airports, and we will keep a close eye on the latest situation, "said Zhu Mei, an Air China spokeswoman.

Other carders including China Southern Airlines, China Eastern Airlines and Hainan Airlines have also canceled most flights to Europe, according to the Civil Aviation Administration of China.

Airlines worldwide are losing at least $200 million per day in revenue, the International Air Transport Association said Friday.

Tourism agencies have been affected too. "This is the first time we met such a natural disaster, and we can only wait and keep in contact with our tourists," said Hun Ping, an employee on duty at China International Travel Service's(CITS) branch in Beijing Sunday. "We have a group of more than 30 Chinese tourists who were scheduled to fly to Paris from Beijing around noon Sunday and their flights will be postponed to tomorrow at the earliest," she said. Hun said another group of Chinese tourists in Europe, who will fly back to Beijing from Brussels Wednesday, might also be affected by the incident. "The possible delay will not add to tourists' financial burdens, as we will share our tourists' additional expenses with the airlines," she said.

1. How many flights has Air China canceled?

A. 8         B. 9           C. 13           D.15

2. What does the word "chaos"(bold in para. 1) mean in the passage?

A. disorder         B. incidents       C. closure      D. damage

3. Which of the following statements is True?

A. The air travel chaos in Europe has caused great losses to only air carriers.

B. The direct reason for the flight cancellation is the closure of most European airport.

C. The International Air Transport Association is suffering a huge loss of $200 million per day.

D. Air China and other Chinese air carriers have already canceled all their flights to Europe.

4. Which of the following is the most suitable title for this passage?

A. Flights Cancellation Caused by Volcanic Eruption

B. The Effects of Volcanic Eruption in Iceland

C. The chaos caused by Volcanic Eruption

D. Tourism Disaster Owing to Volcanic Eruption

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下面几个关于样本均值分布的陈述中,正确的是()。

A.当总体服从正态分布时,样本均值一定服从正态分布

B.当总体服从正态分布时,只要样本容量足够大,样本均值就服从正态分布

C.当总体不服从正态分布时,样本均值一定服从正态分布

D.当总体不服从正态分布时,无论样本容量多大,样本均值都不会近似服从正态分布

E.当总体不服从正态分布时,在小样本情况下,样本均值不服从正态分布

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男患者,65岁,慢支肺气肿20年,冠心病史5年,呼吸困难加重3d,意识障碍1h来诊。查体:浅昏迷,呼吸困难,口唇发绀,球结膜轻度水肿,血压170/100mmHg,双肺散在干啰音,中下部湿啰音,心率130/min,节律不齐,肝略大,下肢水肿(±)。该患者抢救中需特别注意的是

A.予大量快速利尿药

B.畅通呼吸道

C.迅速纠正心律失常

D.强心利尿扩血管综合措施

E.足量的止血药物及脑保护措施

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高大模板支撑系统专项施工方案编制依据包括()等。

A、投标书

B、相关法律、法规

C、规范性文件、标准、规范及图纸(国标图集)

D、定位放线记

E、施工组织设计

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