地梁的跨度一般为( )m。
A.1~3B.6~9C.3~5D.8~10
参考答案:C
解析: 地梁的跨度一般为3~5m。
根据句意及首字母提示完成句子。
1. Liaoning Province is in the n______of China.
2. Taiwan is a p______of China.
3. There is a r______in front of their house. There are a lot of fish in it.
4. Taking a boat must be faster t_______walking.
5. Good health d______on good food, exercise, and getting enough sleep.
影响电缆绝缘电阻测量结果的正确说法是()。
A.绝缘表面的脏污程度对测量结果有一定影响;
B.绝缘介质的绝缘电阻和温度有关,绝缘电阻随温度上升而减小;
C.当空气相对湿度增大时,绝缘电阻变化较大;
D.试验中可以使用屏蔽方法以减少因脏污引起的误差。