SDRAM上有多少个针脚？（）

A、32

B、64

C、72

D、168

Which two statements are correct regarding default protocol preference values?（）

OSPF has a single preference value for both internal and external routes.

RIP is preferred over OSPF external routes.

Direct, local, and static routes have the same preference value.

OSPF's preference value is lower than BGP (both IBGP and EBGP).

Which two statements about subnet masks are true?（）

If a bit is turned on (1), the corresponding bit in the IP address is used for the host portion.

If a bit is turned off (0), the corresponding bit in the IP address is used for the host portion.

If a bit is turned on (1), the corresponding bit in the IP address is used for the network prefix.

If a bit is turned off (0), the corresponding bit in the IP address is used for the network prefix.

设有一个命令按钮Command1的事件过程以及一个函数过程。程序如下：连续单击命令按钮三次，第三次单击命令按钮后，窗体上显示的计算结果是（　　）。

A、10

B、30

C、60

D、70

View the Exhibit and examine the initialization parameter settings. Which three initialization parameters are to be set manually as they are not automatically tuned（）

LOG_BUFFER

SORT_AREA_SIZE

JAVA_POOL_SIZE

STREAMS_POOL_SIZE

DB_16K_CACHE_SIZE

DB_KEEP_CACHE_SIZE

有关系R如下，其中属性B为主键：　　则其中最后一个记录违反了（　　）。

A、实体完整性约束

B、参照完整性约束

C、用户定义的完整性约束

D、关系完整性约束