皮皮学，免费搜题
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搜题
【单选题】
试计算图中所示电阻网络的等效电阻Rab的大小【图片】A.
3.5 Ω
B.
3 Ω
C.
2.5 Ω
D.
5 Ω
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
【单选题】When the school building began to shake,the teachers ran downstairs _____ all the students. The teachers are real heroes. [ ]
A.
after
B.
with
C.
before
D.
at
【单选题】---- What do people mean when they shake their fists? ---- ________. It has different meanings in different countries.
A.
It depends.
B.
Sounds great.
C.
I don’t know.
D.
Don’t mention it.
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