如图是灯L和电阻R的电流随电压变化图像,电阻R的阻值为____Ω,若将他们串联接在电压为2.5V的电源两端,则电路中灯此时的电阻为____Ω.
当前,中国最大的经济特区是( )
如图,已知AB∥CD,AD∥BC,AC与BD交于点O,AE⊥BD于点E,CF⊥BD于点F,那么图中全等的三角形有( )
Hearing the good news that he had been admitted into his dream university after so many years of hard work, his parents couldn't help b____ into tears.
如图为一正在测量中的多用电表表盘.