【单选题】行李从运到日起,包裹从发出通知日起,承运人免费保管()。
【简答题】使用共阴极接法的LED数码管时, a~g应接输出 [填空(1)] 有效的显示译码器;使用共阳极接法的LED数码管时, a~g应接输出 [填空(2)] 有效的显示译码器,这样才能显示0~9十个数字。A. 高电平B. 低电平
【简答题】将十进制数(18)转换成八进制数是 (请直接填入数值,如93)。
【简答题】A. Bill Gates enjoyed playing with earthmoving equipment B. Do you think geniuses are funny or strange? C. Leonardo da Vinci was well known for rideing horses. D. Travelling is a good way for ideas. E...