【单选题】Do your prefer to purchase healthy food or food with more attractive package?
B.
with more attractive passage
【简答题】带阻感性负载时,三相桥式全控整流电路的α角移相范围为 。
【单选题】带阻感负载时,三相桥式全控整流电路α的移相范围是()
【简答题】Food (purchase) ________ in the supermarket must not be delivered to the restaurant.