PPP协议可以封装在哪两种接口上:()A.ETHERNET接口 B.RS232接口

题型:多项选择题

问题:

PPP协议可以封装在哪两种接口上:()

A.ETHERNET接口

B.RS232接口

C.同步接口

D.异步接口

E.令牌环接口

考点:通信工程师有线通信有线通信题库
题型:多项选择题

有一学生学过食品保存知识后到一连锁超市去调查,他看到的食品有:冰柜内的汤圆、牛肉干、熏肠、苹果罐头、纯鲜牛奶、冻鱼、杏脯、咸肉、火腿、熏鱼,请你与他一起对上述食品防腐方法进行分析说明:

(1)不论哪一种方法都是把食品内的细菌和真菌杀死或______细菌、真菌在食品中的______,从而达到防腐目的.

(2)汤圆和冻鱼使用的防腐方法是______.

(3)纯鲜牛奶使用的防腐方法是______.

(4)食品是不是在上述防腐条件下可以永久保存?______;

为什么?______.

题型:多项选择题

可以使不锈钢正畸弓丝变硬的方法是()

A.退火

B.冷加工硬化

C.老化变硬

D.沉积变硬

E.以上均不可以

题型:多项选择题

Buyer and Seller entered into a sales contract which stipulated that Seller should, on or before 10 January 2009, sell a shipment of personal computers (PCs) at a price of 300,000 yuan to Buyer, who should arrange transportation and pay the full price upon taking delivery. For the purpose of launching a market promotion plan at the end of 2008, Buyer asked Seller to provide the goods 20 days before the due date. Seller disagreed with the request since its capacity to process the PC was unable to meet the needs of Buyer. Under such a circumstance, Buyer made efforts to find PCs from other sources, and then transferred the original sales contract to a third party – Company X – with discount. Buyer did not inform Seller of this. On 8 January 2009 Company X despatched a truck to Seller to pick up the PCs under the sales contract. However, Seller refused to provide the PCs on the grounds that there was no contract between Company X and Seller. Required: Answer the following questions in accordance with the relevant provisions of the Contract Law of China, and give your reasons for your answer:

(a) State whether Seller was entitled to refuse to provide the goods. (5 marks)

题型:多项选择题

下面程序的输出结果是 ( )
#define PI 3.1415
#define ARE(x) PI*x*x
main ()
int r=2;
printf("%f",ARE(r+1));

A.28.26

B.28.260000

C.9.28

D.9.280000

题型:多项选择题

人类中能引起强而迅速的、针对同种异体移植物排斥反应的抗原是( )

A.组织相容性抗原
B.移植抗原
C.白细胞抗原
D.主要组织相容性抗原
E.主要组织相容性复合体

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