题目:
— Where did you put the car keys?
— Oh, I _____ I put them on the chair because the phone rang as I _____ in. [ ]
A. remembered; come
B. remembered; was coming
C. remember; come
D. remember; was coming
答案:
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答案:D题目分析:电容器两端的电压与闪光灯两端的电压相等,当电源给电容器充电,达到闪光灯击穿电压U时,闪光灯被击穿,电容器放电,放电后闪光灯两端电压小于U,断路,电源再次给电容器充电,达到电压U时,闪...