—Excuse me, look at the sign “No parking”.—Sorry, I ________ it.
A: don't see
B:haven't seen
C:didn't see
D:won't see
①L2灯丝断了,灯座未短路
②灯泡L2的电阻太小
③灯泡L2两端电压较大
④通过灯泡L1、L2电流不等
⑤灯泡L2的灯座被短路
⑥灯泡L1、L2的额定功率不同
生物学是研究生命现象和生命活动规律的科学。
I don't like this pair of shoes.Can you show me one?