皮皮学，免费搜题
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【单选题】
电力系统失去稳定运行形成几个子系统时属（）A.
紧急状态
B.
警戒状态
C.
崩溃状态
D.
恢复状态
拍照语音搜题，微信中搜索"皮皮学"使用
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【多选题】window shade can also be called________
A.
s un shade
B.
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C.
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D.
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