Which parameters must you select when configuring operating system probes SCREEN options?（）
A、syn-fin, syn-flood, and tcp-no-frag
B、syn-fin, port-scan, and tcp-no-flag
C、syn-fin, fin-no-ack, and tcp-no-frag
D、syn-fin, syn-ack-ack-proxy, and tcp-no-frag
A system administrator is in the process of performing a preservation installation. However, the machine keeps booting up in diagnostic mode. Which of the following is the most probable cause?（）
A、The battery on the machine is bad.
B、The root volume group is corrupted.
C、The low-level debugger is not enabled.
D、There is a problem with the CD-ROM.
A system administrator has an existing mksysb image, but would like to modify the image.data file on the mksysb before installing it on a system. Which of the following procedures is most appropriate to perform?（）
A、Create a new image.data file and recreate the mksysb image.
B、Use the dd command to replace the image.data file on the mksysb tape.
C、Use the tctl command to palce the new image.data file on the mksysb tape.
D、Place the new image.data file on a diskette that will be road during the installation of the mksysb.
徒手绘制基本体时，应先绘制上下底面，再画出（）的轮廓线。
A、侧面
B、上面
C、下面
D、后面
RNC室内联合接地电阻（）
A、小于1欧
B、小于2欧
C、小于3欧
D、小于4欧
Given： What are four valid examples of polymorphic method calls？（）
Ax.a2（）；
Bz.a2（）；
Cz.c1（）；
Dz.a1（）；
Ey.c1（）；
Fx.a1（）；
