In the dark night of the desert, a group of US Air Force scientists is testing a new device for a missile to target. Designed to seek out the heat of an enemy aircraft engine, it is now going through its paces by tracing the movement of a flashlight waving thirty feet away in the darkness. A hundred yards away, unseen by the man, a rattlesnake sliding between the stones senses a patch of warmth. Although the snake’s mechanism is small enough to be packed into a head the size of a nut, it can detect a change in temperature of one-thousandth of a degree. With a sound the snake closes in and strikes for the kill. Whenever we look in the animal world we find the same story. Almost anything that man can do, nature has already done better. So, it is for the purpose of learning from nature that a new science called bionics has grown up. Its aim is to find out how animal’s instruments work so that man can copy them for his own purpose. Imagine being able to know a friend several miles off by his smell. Male silk moths can do this. Their antennae are so sensitive to the chemical odor of female moths that they can detect their presence by picking up only one molecule of the chemical. Even with their most sensitive instruments, human cannot approach this perfection. Studying beetle’s eyes has already paid off. A group of scientists in Germany found that a beetle can accurately measure with its eyes the speed of moving background. After finding out how a beetle accomplishes this scientists built a machine that operated on the same principle. This instrument is able to determine the ground speed of moving aircraft with a high degree of accuracy. Which of the following is wrong
A. Studying the eye of the beetle has helped scientists to measure speed of objects.
B. Male silk moths can know female silk moths several miles off by their smell.
C. Devices of animals discussed here serve a purpose similar to the skin of the human.
D. The military uses of bionics are one for developing this scienc
1918年,H.G.莫尔顿提出了资产转换理论,其缺陷包括()。
A. 局限于短期贷款不利于经济的发展
B. 贷款平均期限的延长会增加银行系统的流动性风险
C. 自偿性贷款随经济周期决定信用量,从而会加大经济波动
D. 在经济局势和市场状况出现较大波动时,证券的大量抛售同样会造成银行的巨额损失
E. 由于收入预测与经济周期有密切联系,资产的膨胀和收缩会影响资产质量,因此会增加银行的信贷风险