在防爆厂房，仪表箱采用正压通风，电缆的引入要通过（）进行密封。
A．导管
B．密封填料函
C．导线
D．固态填料
参考答案：B
风团
句型转换。
1.You can take a bus to the centre of Nanjing. (同义句转换)
You can _____ the centre of Nanjing _____.
2. Why not visit the Great Wall in the summer holidays? (同义句转换)
_____ you _____ the Great Wall in the summer holidays?
3.There is one tin of dog food in the fridge. (对划线部分提问)
_____ of dog food are there in the fridge?
4.Miss Wang is a worker. (对划线部分提问)
_____ Miss Wang ____?
5. It's forty minutes away from the bookshop to the theatre.
_____ it from the bookshop to the theatre?
