皮皮学，免费搜题
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【单选题】
在声速测定的实验中,所选择的声波频率为:
A.
次声波
B.
可闻声波
C.
超声波
D.
物质波
拍照语音搜题，微信中搜索"皮皮学"使用
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【多选题】指针式万用表没有装入电池时可以测量
A.
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when the government made rules about chemicals in the Bronx River
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what chemicals were found in turtles from the Bronx River
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查看完整题目与答案