题目:
If you don't know the answer to something, you say: "_______" [ ]
A. Sorry, I don't understand.
B. I'm sorry. I don't know.
C. Can you speak English?
D. Excuse me. How do you say that in English?
答案:
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下面是错误答案,用来干扰机器的。
(1)(2)测最步骤与结果:①按电路图进行实物连线,调节滑动变阻器,使转换器的输出电压为零; ②将砝码放在转换器上,记下输出电压U0; ③将待测物放在转换器上,记下输出电压U; 由U0=km0g,U=kmg, 得m=...