题目内容
分辨率是扫描仪的重要性能指标，反映了扫描仪扫描图像的清晰程序。下面是有关扫描仪分辨率的叙述： I．分辨率的单位为dpi，表示原始稿件上每平方英寸采集的像素数目 II．分为光学分辨率插值分辨率两种，插值分辨率一般高于光学分辨率 III．光学分辨率由扫描仪光学和机械系统的特性决定 IV．插值分辨率指扫描仪感光元件(CC能达到的最大分辨率 上述叙述中，哪些是正确的？
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银行现金流量表反映的是银行一定时期中经营活动、投资活动、筹资活动所产生的利润。()
Part A
Directions: Read the following three texts. Answer the questions on each text by choosing A, B, C or D. Mark your answers on ANSWER SHEET 1.
In recent years scientists have found that the laser has a wide variety of applications, making it one of the most important inventions for improving our quality of life.
One important field in which the laser has many applications is communications. Scientists have found that the laser beam can transmit human voices; as a result, telephone companies are now using laser light signals to transmit telephone calls through extremely small cables that are capable of carrying many more transmissions than the standard telephone cables. An additional advantage is that these systems using the laser light signals are also able to transmit video telephone conversations.
Another, perhaps less-known, field in which lasers are helping improve the quality of life is metrology—the science of measurement. The extremely straight, narrow laser beam can be used to put the parts of a structure being built into the correct position to each other. The laser beam has also been used to measure remote distances, for example, the precise distance from the Earth to the Moon. And finally, the laser can be used to measure the drifts of the Earth's plates. This measurement, along with other data, can help in the pre-diction of the earthquakes.
Probably the most vital application of the laser is in the field of medicine. Scientists have developed a laser kniffe that surgeons can use for operations. These knives are now used widely because they cut sharply and because the beam seals off the blood vessels that it cuts, thus reducing blood loss considerably.
When Dr. Theodore got the first laser to work in July 1960, what uses it would have were unknown; in fact he called it a multimillion-dollar "solution in search of a problem". As we have seen, the uses of the laser are numerous. It is being used in the fields of medicine, communications, and metrology. There are many, many more applications, such as in the areas of defense and space travel. What should be apparent by now is that there are many problems the laser is helping to solve, and that the laser, if used wisely, can be a life-saving device.
According to the text, the laser can______.
What is the writer's comment on park rangers work？
It can be inferred from the text that
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