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问题 解答题

一个两位数，其中个位上的数字比十位上的数字大2，且这个两位数能被5整除，求符合上述条件的两位数．

答案

根据5的倍数特征，能被5整除的数的个位是0或5，

又已知个位上的数字比十位上的数字大2，

当个位上是0时，十位上是0-2=-3，不可能；

当个位上是5时，十位上是5-2=3，因此，这个数是35．

故答案为：35．

判断题

国家标准规定：普通轴承也必须标全轴承代号，各段不得省略。
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单项选择题

Hardin argued that grazing land held in common (that is, open to any user) would always be used less carefully than private grazing land. Each rancher would be tempted to overuse common land because the benefits would accrue to the individual, while the costs of reduced land quality that results from overuse would be spread among all users. But a study comparing 217 million acres of common grazing land with 433 million acres of private grazing land showed that the common land was in better condition.
The answer to which of the following questions would be most useful in evaluating the significance, in relation to Hardin’s claim, of the study described above

A．Did any of the ranchers whose land was studied use both common and private land

B．Did the ranchers whose land was studied tend to prefer using common land over using private land for grazing

C．Was the private land that was studied of comparable quality to the common land before either was used for grazing

D．Were the users of the common land that was studied at least as prosperous as the users of the private land

E．(E) Were there any owners of herds who used only common land, and no private land, for grazing
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