A:did, be freed
B:had done, would be freed
C:should do, should be freed
D:should do, wa
如图所示电路,灯泡L1、L2、L3分别标有“6V 3W”、“6V 3.6W”、“10V 5W”字样(不考虑温度对灯丝电阻的影响).
①试管;②烧杯;③酒精灯;④试管架;⑤石棉网;⑥铁架台(带铁圈)
判断对错
三角形的底等于三角形的面积除以高