如图电路中,闭合开关S,两只电压表示数如图乙,则电源电压为____V,灯L1两端电压为____V,灯L2两端电压为____V.
下列词语中,没有错别字的一组是 ( )
已知集合A={1,2,3}, BA={3},BA={1,2,3,4,5},则集合B的子集的个数为( )
It's reported that there are more than 300 smokers in China, nearly a third of all the smokers in the world.
79≈____ 91≈____
288≈____ 324≈____
607≈____ 878≈____
5198≈____ 6950≈____
7704≈____ 7074≈____