A:He often goes to the cinema.
B:He often plays table tennis.
C:He often goes climbing.
读图,下列叙述正确的是
在“伏安法测电阻”的实验中,滑动变阻器不能起到的作用是 ( )
比一比,再组词
棵____ 助____ 拔____
课____ 协____ 泼____