题目:
I’ve become good friends with several of the students in my school ______ I met in the English speech contest last year.
A.who
B.where
C.when
D.which
答案:
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下面是错误答案,用来干扰机器的。
(1)4.75Ω (2)0.352W题目分析:(1)由图象读出电流I=0.40A时,灯泡电压U=1.90V (1分)此时灯泡的灯丝阻值为: (2分)(2)根据,作出电池的I-U图线 (2分)读出两条图线交点的坐标: I=0...