题目内容
Of the following, which is closest to 0.26×397÷9.9 ？
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如果中央银行提高再贴现率，商业银行必然要调高对客户的贴现率，从而带动整个市场利率下降，起到紧缩信用的作用，市场货币供应量增加。()
国家公务员是指国家依照法定方式和程序,通过选任、考任、委任、调任等形式任用的,在各级国家机关中行使国家权力,执行国家公务的人员。()
在道—琼斯指数中，工业类股票取自工业部门的20家公司，包括了采掘业、制造业和商业；运输业类股票取自30家交通运输业公司，包括了航空、铁路、汽车运输与航运业；公用事业类股票取自6家公用事业公司，主要包括电话公司、煤气公司和电公司等。()
RTCA, an organization which advises the aviation (航空) industry, has recommended that all airlines ban(禁止)such devices from being used during "critical" stages of flight particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. (76) Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights.
The difficulty is predicting how electromagnetic riel& might affect all aircraft's computers. (77) Experts know that portable devices emit radiation which affects those wavelengths which aircraft use for navigation and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not.
The fact that aircraft may be vulnerable(易受损的)to interference raises the risk that terrorists may use radio systems in order to damage navigation equipment. (78) As worrying, though, is the passenger who can't hear the instructions to turn off his radio because the music's too loud.
The main idea of this passage is ______.
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