皮皮学，免费搜题
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搜题
【单选题】
输入是交流,输出是交流的电路称为( )A.
整流
B.
逆变
C.
直流斩波
D.
交交变频
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【多选题】Who are usually the readers of the research proposals?
A.
Professionals
B.
Specialists
C.
Supervisors for the students
D.
Professors
【简答题】"What does he often talk about?" the girl wondered. The girl wondered ______ ______ ______ ______about.
【单选题】Luis says, "Everyone's got a story." What does he mean?
A.
Many people's families come from other places.
B.
I don't like to tell stories.
C.
People often come to California.
【判断题】Proposals usually appear in three forms: practical proposals,researched policy proposals and proposal speeches.
A.
正确
B.
错误
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