[填空题]A layer of blubber approximately six inches thick protects the whale in Arctic waters.

[填空题]A layer of blubber approximately six inches thick protects the whale in Arctic waters.

[填空题] thick

[单项选择] (51) is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
(52) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
(53) functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.
(54) is the popular LAN developed under the direction of the IEEE802.5.
(55) is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

A. The MAC address
B. The IP address
C. The subnet address
D. The virtual address

[简答题]下列程序的功能是：计算出自然数SIX和NINE，它们满足的条件是SIX+SIX+SIX=NINE+NINE的个数cnt，以及满足此条件的所有SIX与NINE的和sum。请编写函数countValue（　）实现程序要求，最后调用函数writeDAT（　）把结果cnt和sum输出到文件 OUT51.DAT中。其中的S，I，X，N，I，N，E各代表一个十进制数。
注意：部分源程序已给出。
请勿改动主函数main（　）和写函数writeDAT（　）的内容。
#include＜stdio. h＞
int cnt, sum;
void countValue （　）


void main （　）

cnt=sum=0;
countValue （　）;
printf ( "满足条件的个数=%d/n", cnt);
printf ("满足条件所有的SIX与NINE的和=%d/n", sum);
writeDAT （　）;

writeDAT （　）

FILE *fp;
fiD=foDen ("OUT51. DAT", "w" );
fprintf (fp, "%d/n%d/n", cnt, sum);
fclose (fp);

[单项选择]Why do the workers wear thick glasses
A. Because they can’t see.
B. Because the weather is very hot.
C. Because they will keep their eyes saf

[单项选择]Thick clouds obscured the stars from view.
A. darkened
B. held
C. blackened
D. prevent

[单项选择]

Traditional network layer packet forwarding relies on the information provided by network layer （） protocols, or static routing, to make an independent （）decisions at each hop within the network. The forwarding （） is based solely on the destination （） IP address. All packets for the same destination follow the same path across the network if no other equal-cost paths exist. Whenever a router has two equal-cost （） toward a destination, the packets toward the destination might take one or both of them, resulting in some degree of load sharing.

Traditional network layer packet forwarding relies on the information provided by network layer （） protocols, or static routing
A. rotating
B. routing
C. transmission
D. management

[单项选择]A client hospitalized with pneumonia has thick, tenacious secretions. To help liquefy these secretions, the nurse should
A. turn the client every 2 hours.
B. elevate the head of the bed 30 degrees.
C. encourage increased fluid intake.
D. maintain a cool room temperatur

[单项选择]
Why must the workers wear thick glasses