Why don't you ____________ to school early? [ ]
A. to come
B. come
C. coming
答案:B
图特摩斯三世
把电动势为1.5V的干电池以正向接法直接接到一个硅二极管的两端,则该管()。
A.电流为零
B.电流基本正常
C.击穿
D.被烧坏