挑战习题
1/5单选题
难度:

1.

在手电筒电路中,提供电能的是(  )


A

电池

B

灯泡

C

导线

D

开关

提示1:
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正确答案:QQ==
PGRpdj7lnKjmiYvnlLXnrZLkuK3vvIznlLXmupDmmK/nlLXmsaDvvIznlKjnlLXlmajmmK/nga/ms6HvvIzmiYDku6Xmj5DkvpvnlLXog73nmoToo4Xnva7mmK/nlLXmsaDvvIzogIzlr7znur/mmK/nlKjmnaXov57pgJrnlLXot6/nmoTvvIzlvIDlhbPmmK/nlLXot6/nmoTmjqfliLboo4Xnva7jgILliJlB6YCJ6aG55q2j56GuPC9kaXY+