【单选题】下列选项不属于青年消费群体的消费特征的是()
【简答题】在谐振型开关电源中,由于功率开关管实现了()或()切换,因此基本上消除了;同时由于功率开关管的导通电阻非常小,所以()也非常小。
【单选题】In China it is a custom to give kids lucky money _________ during the Spring Festival. [ ]
【单选题】It is common to give children and the seniors some lucky money on the eve of the Spring Festival.