电流互感器工作时，其二次侧不允许短路。
参考答案：错
若奇函数f（x）定义域为R，且x≥0时，f（x）=x（x+1），则x∈R时f（x）的解析式为______．
The door opened and _____ a middle-aged woman with fashionable clothes. [ ]
A. came in
B. in came
C. did come in
D. in did come
