问题
名词解释
前置电路
答案
参考答案：
前置电路是专门为一些传感器所设计，转换等输出为标准4－20mA的一种电路。
搜题请搜索小程序“爱下问搜题”
前置电路
参考答案：
前置电路是专门为一些传感器所设计，转换等输出为标准4－20mA的一种电路。
| 阅读下面的短文，掌握其大意，然后从短文后各题所给的四个选项中，选择最佳选项。 | ||||
| As darkness fell, hundreds of people in the Swiss village left their houses. They were staring (注视) forward at the mountain top in the distance. It was covered with ice and snow — beautiful and dangerous. The huge mountain is called Matterhorn. Mountain climbers had 1 the top through the southern route (路线). But no one had ever dared to try a winter climbing up the northern side. But now one man was daring to try the 2 route. He was Walter Bonatti, a great mountain climber from Italy. For two days he had climbed. The village people had watched him 3 . Now they were waiting to see his signal. If he planned to 4 the next day, he would light (点燃) a green signal. A red light would mean that he was turning back. A tiny green light 5 high on the mountain side. Bonatti was not giving up! The people 6 . The next day he continued his way upward. He was so lonely and so 7 ! But he would not give up. Again that night he lit the green light. In the morning, Bonatti 8 . He could not see the top, he knew he was almost there. Though the climb was painful, he moved up. Bonatti had spent months 9 for the climb. Was the training enough? Did he have the strength and skill to climb to the top? He was finally at the top! News about his success was radioed to the world. The trip down the southern route was easy. He was warmly welcomed in the village. He had done the " 10 " and would be well remembered as a climber of all time. | ||||
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