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 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

Click the Exhibit button. What is the result？（）

A、 Value is： 8

B、 Compilation fails.

C、 Value is： 12

D、 Value is： -12

Given： What are four valid examples of polymorphic method calls？（）

x.a2（）；

z.a2（）；

z.c1（）；

z.a1（）；

y.c1（）；

x.a1（）；

Given that t1 is a reference to a live thread， which is true？（）

A、The Thread.sleep（） method can take t1 as an argument.

B、The Object.notify（） method can take t1 as an argument.

C、The Thread.yield（） method can take t1 as an argument.

D、The Thread.setPriority（） method can take t1 as an argument.

E、The Object.notify（） method arbitrarily chooses which thread to notify.