题目内容 (请给出正确答案)
提问人:网友13***556 发布时间:2022年5月1日 23:22
[判断题]

只要 8259A 所管理的中断源没有被屏蔽,则任何中断源的中断请求都能得到 CPU 的响应和服务。

A. 对B. 错

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(85)This newest method of searching for minerals is based on the fact that minerals deep in the earth may affect the kind of trees and bushes that grow on the surface.At Watson Bar Creek, a brook six thousand feet high in the mountains of British Columbia, Canada, a mineral search group gathered bags of tree seeds. Boxes were filled with small branches from the trees, and roots were dug out and put into boxes with each bag and box carefully marked. In a scientific laboratory, the parts of the forest trees were burned to ashes and tested. Each small part was examined to learn whether there were minerals in it.
Study of the roots, branches, and seeds showed no silver. But there were small amounts of gold in the roots and a little less gold in the branches and seeds. The seeds growing nearest to the tree trunks had more gold than those growing "on the ends of the branches.
If the trees had not indicated that there was gold in the ground, the scientists would not have spent money to pay for digging deeper. They did dig and found more gold below. When they dug deeper, they found large quantities of gold.
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