直流牵引电动机采用磁场削弱,不仅能发挥电机的全功率,甚至能够提高电机的()。
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Consider the following configuration: /devices/diskP1 is a member of disk group grp1. /devices/diskP2 is a member of disk group grp1. /devices/diskP3 is a member of disk group grp1. /devices/diskP4 is a candidate disk. /devices/diskQ1 is a member of disk group grp2. /devices/diskQ2 is a member of disk group grp2. /devices/diskQ3 is a member of disk group grp2. /devices/diskQ4 is a candidate disk. Which command will add the disk /devices/diskP4 to the disk group, grp1?()
ALTER DISKGROUP grp1 ADD DISK ’/devices/diskP1’, ADD DISK ’/devices/diskP4’;
B. ALTER DISKGROUP grp1 ADD DISK ’/devices/disk*4’;
C. ALTER DISKGROUP grp1 ADD DISK ’/devices/diskP*’;
D. ALTER DISKGROUP grp1 ADD DISK ’/devices/diskQ*’, ADD DISK ’/devices/diskP*’;
在没有划分车道线的道路上()。
A. 机动车在左边行驶,非机动车在右边行驶
B. 机动车在中间行驶,非机动车在右边行驶
C. 机动车在右边行驶,非机动车在路边行驶
丝杆和螺母之间的相对运动属于()。
A. 螺旋传动
B. 啮合传动
C. 磨擦传动
D. 滚动传动