注册商标需要变更注册商标标识的，需要（）。
A.重新申请
B.提出补充申请
C.提出变更申请
参考答案：A
A boy with two dogs _______ when the earthquake happened. [ ]
A. were sleeping
B. were asleep
C. was sleeping
D. fell asleep
定子绕组为Y接的三相异步电动机，检修时两相绕组烧坏，其最大可能的原因是（）。
A.单相运行
B.匝间短路
C.严重过载
