[判断题]装运电杆、变压器和线盘应绑扎牢固，并用绳索绞紧。水泥杆、线盘-我要搜题网

[单选题]《铁路旅客运输办理细则》（铁运〔1997〕103号）规定，代用票的()联按合计栏款额在相应的剪断线剪断后交旅客。
A.甲
B.丙
C.丁
D.乙

[单选题]党的工作重心由乡村转移到城市的决定是在()上作出的。
A.中共七大
B.中共七届二中全会
C.中共七届三中全会
D.中共七届四中全会

[单选题]在雷诺实验中流速逐渐减小流动状态由紊流转变为层流的临界流速称为（）。
A.上临界流速
B.下临界流速
C.中临界流速
D.平均临界流速

[单选题]根据工作许可证的要求，负责人应向作业人员交代工作任务和沟通工作申请单中分析的作业风险及（）
A.电压
B.防护
C.安全措施
D.说明

[不定项选择题]共用题干第一篇

Unidentified Flying Object

Unidentified flying Object(UFO)is any object or light,reportedly sighted in the sky,that cannot be immediately explained by the observer. Sightings of unusual aerial phenomena date back to ancient times,but UFOs(sometimes called flying saucers)became widely discussed only after the first widely publicized U.S.sighting in 1947.Many thousands of such observations have since been reported worldwide.
At least 90 percent of UFO sightings can be identified as conventional objects,although time consuming investigations are often necessary for such identification.The objects most often be mistaken for UFOs are bright planets and stars,aircraft,birds,balloons,kites,aerial flares,peculiar clouds, meteors（流星）,and satellites. The remaining sightings most likely can be attributed to other mistaken sightings or to inaccurate reporting, tricks, or delusions（妄想）,although to disprove all claims made about UFOs is impossible.
From 1947 to 1969 the US air force investigated UFOs as a possible threat to national security. A total of 12,618 reports was received,of which 701 reports,or 5.6 percent,were listed as unexplained.The air force concluded that"no UFO reported,investigated,and evaluated by the Air Force has ever given any indication of threat to our national security."Since 1969 no agency of the US government has had any active program of UFO investigation.
Some persons, however, believe that UFOs are extraterrestrial（地球外的）spacecraft, even though no scientifically valid evidence supports that belief. The possibility of extraterrestrial civilizations is not the stumbling block（障碍物）;most scientists grant that intelligent life may well exist elsewhere in the universe.A fully convincing UFO photograph of a craft like object has yet to be taken, however, and the scientific method requires that highly speculative（推测性的）explanations should not be adopted unless all of the more ordinary explanations can be ruled out.
UFO enthusiasts persist,however,and some persons even claim to have been captured and taken aboard UFOs.No one has produced scientifically acceptable proof of these claims.Behavioral scientist Car Sagan of Cornel University has proposed that"certain psychological needs are met by belief in superior beings from other worlds." According to the passage,which of the following statements is NOT true about the UFO investigation by the US Air Force?
A.Approximately 94 percent of the UFO reports received were explained.
B.UFOs were once regarded as a potential danger to national safety.
C.The investigation showed that America will not be threatened by the reported UFOs.
D.The investigation proved that further UFO research would be of great value.

[判断题]装运电杆、变压器和线盘应绑扎牢固，并用绳索绞紧。水泥杆、线盘的周围应塞牢，防止滚动、移动伤人。A.正确B.错误

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[判断题]装运电杆、变压器和线盘应绑扎牢固，并用绳索绞紧。水泥杆、线盘的周围应塞牢，防止滚动、移动伤人。
A.正确
B.错误