Has-a relationships should never be encapsulated.
Has-a relationships should be implemented using inheritance.
Has-a relationships can be implemented using instance variables.
Is-a relationships can be implemented using the extends keyword.
Is-a relationships can be implemented using the implements keyword.
An array or a collection can be used to implement a one-to-many has-a relationship.
第1题：
A. A DBA can enable or disable an individual task in all maintenance windows.
B. A DBA cannot change the duration of the maintenance window after it is created.
C. In case of a long maintenance window, all Automated Maintenance Tasks are restarted every four hours.
D. A DBA can control the percentage of the resource allocated to the Automated Maintenance Tasks in each window.
第2题：
A. There are two broadcast domains in the network.
B. There are four broadcast domains in the network.
C. There are six broadcast domains in the network.
D. There are four collision domains in the network.
E. There are five collision domains in the network.
F. There are seven collision domains in the network.
第3题：
Which of the following statements about Leopold and Rudolph Blaschka is TRUE?
A. They were brothers.
B. They were artists.
C. They were florists.
D. They were farmers.
32．答案为B。根据第一段最后一句，the work of two artists-naturalists，Leopold Blaschka and his son Rudolph作出该项选择。
第4题：
Which of the following statements is true regarding the VERSIONS BETWEEN clause？（）
第5题：
第6题：
A. The route 192.168.1.0/25 is accepted
B. The route 192.168.2.0/24 is accepted
C. OSPF routes will be exported into RIP
D. RIP routes will be exported into OSPF
第7题：
An access list was written with the four statements shown in the graphic.Which single access list statement will combine all four of these statements into a single statement that will have exactly the same effect？（）
A.access-list10 permit 172.29.16.00.0.0.255
B.access-list10 permit 172.29.16.00.0.1.255
C.access-list10 permit 172.29.16.00.0.3.255
D.access-list10 permit 172.29.16.00.0.15.255
E.access-list10 permit 172.29.0.00.0.255.255
第8题：
Which of the following statements is TRUE?
A. Every businessman possesses these four skills.
B. When a striver stops his devotion to work，he will feel quite at ease.
C. These basic skills are not instinctual at all.
D. Mother's education has undoubted effect on her child's success.
第9题：
Which two statements are true about L2TP tunnels?（） (Choose two.)
第10题：
Which statement is true regarding the INTERSECT operator?（）