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本实验操作中用“交换法”（即将Rx与R0互换进行测量）可以减小测量误差，其具体原因是什么？2、电桥上的滑动触头“D”实为一按钮开关，一般采取“跃接法”。此处为什么要用按钮开关而不是一般开关?3、在实验中，若保护电阻（滑动变阻器）R未调至最小，而检流计指针指零，电桥是否一定平衡？为什么？ 4、在实验中，有哪些途径可以适当提高电桥灵敏度？ 5、实验中若发现检流计指针始终不偏转，有可能是哪些原因？
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【单选题】在 ( ) 的情况下,函数 Y=A+B 运算的结果是逻辑“ O ”
A.
、全部输入是“ o ”
B.
、任一输入是“ O ”
C.
c 、任一输入是“ l ”
D.
、全部输入是“ l ”
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【简答题】You have been asked to read and preview the text before class. To check your preview effect, please complete the following passage with words chosen from the box. admitted disturbing sad recent ...
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相关题目：
【单选题】在 ( ) 的情况下,函数 Y=A+B 运算的结果是逻辑“ O ”
A.
、全部输入是“ o ”
B.
、任一输入是“ O ”
C.
c 、任一输入是“ l ”
D.
、全部输入是“ l ”