國家電網(wǎng)專業(yè)技術(shù)人員電力英語水平考試樣題及答案-文庫吧資料
2024-10-26 21:25本頁面
【正文】 ct them, sense them, without a radio receiver. Similarly, we cannot sense radioactivity without a radio detector. But unlike mon radio waves, unclear radiation is not harmless to human beings and other things. At very high levels, radiation can kill an animal or human being outright by killing masses of cells in vital ans. But even the lowest levels can do serious damage. There is no level of radiation that is pletely safe. If the radiation does not hurt anything important, the damage may not be significant. This is the case when only a few cells are hit, and if they are killed outright, your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They reproduce themselves in a deformed way. They can grow into cancer. Sometimes this does not show up for many years. This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the victim being aware at the time that damage has occurred. A person can receive radiation and feel fine, then die of cancer five, ten or twenty years later as a result. 1. The mystery about nuclear radiation may e from the fact that it cannot be detected by human senses. A. Right B. Wrong 2. We cannot sense radio activity without a radio receiver. A. Right
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