【简答题】三相单三拍运行的反应式步进电动机中, “ 三相 ” 、 “单”“三拍”分别指什么意思?
【单选题】IP地址块213.118.17.116/24和218. 116.119.15/23的子网掩码分别可写为
A.
255.255.255.0和255.255.254.0
B.
255.255.248.0和255.255.240.0
C.
255.255.254.0和255.255.252.0
D.
255.255.252.0和255.255.248.0
【判断题】三相单三拍运行的反应式步进电动机中, “ 三拍 ”是指经过三次切换控制绕组的通电状态为一个循环。
【单选题】听力原文:W: Excuse me, can you tell me where the Staff's Association is meeting? M: It was going to meet in Room 110, but was changed to the auditorium for more space. Where is the Association meeting?
【判断题】证券具有两个最基本的特征:一是权利特征;二是书面特征。