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Peter really loves music and he wants to be a ______ in the future.
10个月前
如图,矩形ABCD中,AB=3,BC=4,点E是BC边上一点,连接AE,把∠B沿AE折叠,使点B落在点B′处,当△CEB′为直角三角形时,BE的长为_________.
1年前
1年前
When I was young, I was always frustrated ( 挫败的 ), and almost everything ended in failure.
1年前
请写出CuCl2溶液中加入氢氧化钠溶液的化学式,并说明为什么会生成蓝色沉淀.
1年前