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【单选题】
If there is one thing scientists have to hear, it is that the game is over. Raised on the belief of an endless voyage of discovery, they recoil from the suggestion that most of the best things have already been located. If they have, today's scientists can hope to contribute no more than a few grace notes to the symphony of science. A book to be published in Britain this week, The End of Science, argues persuasively that this is the case. Its author, John Horgan, is a senior writer for Scientific American magazine, who has interviewed many of today's leading scientists and science philosophers. The shock of realizing that science might be over came to him, he says, when he was talking to Oxford mathematician and physicist Sir Roger Penrose. The End of Science provoked a wave of denunciation in the United States last year. 'The reaction has been one of complete shock and disbelief, 'Mr. Horgan says. The real question is whether any remaining unsolved problems, of which there are plenty, lend themselves to universal solutions. If they do not, then the focus of scientific discovery is already narrowing. Since the triumphs of the 1960s—the genetic code, plate tectonics, and the microwave background radiation that went a long way towards proving the Big Bang—genuine scientific revolutions have been scarce. More scientists are now alive, spending more money on research, that ever. Yet most of the great discoveries of the 19th and 20th centuries were made before the appearance of state sponsorship, when the scientific enterprise was a fraction of its present size. Were the scientists who made these discoveries brighter than today's? That seems unlikely. A far more reasonable explanation is that fundamental science has already entered a period of diminished returns. 'Look, don't get me wrong,' says Mr Horgan. 'There are lots of important things still to study, and applied science and engineering can go on for ever. I hope we get a cure for cancer, and for mental disease, though there are few real signs of progress.' The sentence 'most of the best things have already been located' could mean______.
A.
most of the best things have already been changed
B.
most of the best things remain to be changed
C.
there have never been so many best things waiting to be discovered
D.
most secrets of the world have already been discovered
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【多选题】安全生产事故隐患是指生产经营单位违反安全生产法律、法规、规章、标准、规程和安全生产管理制度的规定,或者因其他因素在生产经营活动中存在可能导致事故发生的____.
A.
环境因素
B.
物的危险状态
C.
自然灾害
D.
人的不安全行为
E.
管理上的缺陷
【单选题】通常情况下,生产安全事故隐患是指生产经营单位违反安全生产法律、法规、规章、标准、规程、安全生产管理制度的规定,或者其他因素在生产经营活动中存在的可能导致伤亡事故发生的( )。
A.
物的危险状态
B.
人的不安全行为
C.
管理上的缺陷
D.
以上三者
【判断题】在三相电路中,不论电源还是负载,都可以接成Y和△。
A.
正确
B.
错误
【单选题】CRH1二等车固定座椅前后间距为()。
A.
880mm
B.
900mm
C.
910mm
D.
890mm
【单选题】下列各门电路符号中,不属于基本门电路的是 ( )。
A.
B.
C.
D.
D
【简答题】组合受力与变形是指 。
【单选题】最可能受到多环芳烃化合物污染的食品是( )。
A.
熏肉
B.
腊肉
C.
咸肉
D.
火腿
【单选题】以下几个选项中,哪一项是不正确的
A.
捕捞业管理者的失败是因为他们研究的对象是有限的种群数量,无法完美预测整个系统的反应
B.
生态系统中的某个组分在跨越某个阈值后可能会进入另一种可更替的稳定状态
C.
如果推动生态系统朝一个方向发展,那么生态系统会逐渐补充并最终接近自然的平衡状态
D.
如果放任生态系统发展,其也会呈现出某种平衡状态,且一定与自然平衡状态不同
【判断题】事故隐患是生产经营单位违反安全生产法律、法规、规章、标准、规程和安全生产管理制度的规定或者因其他因素共同作用的结果。()
A.
正确
B.
错误
【单选题】CRH1二等车固定座椅前后间距为( )。
A.
880 mm
B.
890 mm
C.
900 mm
D.
910 mm
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