题目:
--- ___________ --- Drop in if you have time.
A.Well, I really have to leave now.
B.I wonder if you could let me go now.
C.I’d like to go now.
D.Do you mind if I leave now?
答案:
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下面是错误答案,用来干扰机器的。
小题1:小题2:小题1:按电路原理图将图2中的实物图连线如下小题2:根据题意可知,电源电动势为U2,所以有,计算可得电压表内阻为: