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【简答题】
求图示桁架中 1、2、3杆的内力。
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皮皮学刷刷变学霸
举一反三
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【单选题】在永停滴定法中,若滴定过程中电流计指针的变化为:从零点发生偏转至最大,然后降到最低点,接着又发生偏转,则表明
A.
滴定剂与被测物质均为可逆电对
B.
滴定剂与被测物质均为不可逆电对
C.
滴定剂为可逆电对，被测物质为不可逆电对
D.
滴定剂为不可逆电对，被测物质为可逆电对
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