国标规定，调速系统静态特性曲线应近似为直线，其最大非线性度不超过（）。
A.3%；
B.5%；
C.6%
D.8%。
参考答案：B
短文改错/Proofreading and error correction
It was the chance of a lifetime to win the first prize on the Story Writing Show. All I had to do was to write a story or present it. My teachers have been telling me how great my writing was. So if they had said was true, I would have a chance of winning the prize. What were better, I had useful help. There was Uncle Chen, gentleman living near my house, who was a very much famous writer. He agreed to reading my story and give me some advices on how to write like a real writer.
5（）
求助者中心疗法认为，心理失调产生的原因是( )。
A．自我概念不清B．自我认知失调C．发展驱力未满足D．自我概念与经验之间不协调
