变压器的铁芯必须接地,其接地点只能是()。
A.一点
B.两点
C.按容量选择
参考答案:A
After graduation from college, he began to wander from city to city, ____ a suitable job.[ ]
A. hunting for
B. taking on
C. looking after
D. will survive
将光盘CD-ROM(hdc)安装到文件系统的/mnt/cdrom目录下的命令是()。
A.mount/mnt/cdrom
B.mount/mnt/cdrom/dev/hdc
C.mount/dev/hdc/mnt/cdrom
D.mount/dev/hdc