施工现场环境的相对湿度高于80%，或钢材表面温度低于空气露点温度( )℃时，禁止喷射除锈施工。
A．1B．2C．3D．5
参考答案：C
西周初年，设立封国的数量为[ ]
A．50个
B．51个
C．17个
D．71个
句型转换。
1. We had a big welcome meeting yesterday evening. (对画线部分提问)
_____ _____ you _____ a big welcome meeting?
2. She often does some washing on Sunday morning. (改为一般过去时态)
She _____ _____ _____ this Sunday morning.
3. I have already finished reading the novel. (改为否定句)
I _____ finished reading the novel.
4. My sister has got a rat snow globe. (对画线部分提问)
_____ _____ your sister got?
5. We've never learned Japanese. (改为反意疑问句)
We've never learned Japanese, _____?
