I __________ anything because they were so expensive.
A:didn't buy
B:bought
C:not buy
D:didn't bought
将下列陈述句改成反问句
①你不能这样做。
②别人能办到的事,我们也能办到。
①x﹣40%x=12
②15x﹣30=15
③0.5x+ 12 x=6.
根据甲所示的电路图,在乙图中用笔画线代替导线,把实物图连接起来(注意导线不得交叉).