在下列铸铁材料中,机械性能提高,甚至接近钢的是()
A.孕育铸铁
B.可锻铸铁
C.球墨铸铁
D.合金铸铁
参考答案:C
根据汉语意思填写句子。
1. —Where is John's seat? —It's ______(紧挨着) Mike's.
2. There is a tall tree ______(在前面) the house.
3. Give me ______ (一份) newspaper.
4. That child was born in ______ (狗年).
5. I have a pen in ______ (以……形状) a rabbit.
110kV及以上的配电装置,一般将避雷针装在配电装置的架构或房顶上,但在电阻率大于( )地区,宜装设独立避雷针。
A.350Ω·m; B.500Ω·m; C.750Ω·m; D.1000Ω·m。