It is known to everyone that no smoking ______ （permit)in the library．

A.It

B.As

C.That

D.What

A、know

B、knows

C、have known

D、has known

A. as many

B. as much

C. more

Every familiar object she touched seemed to have a new meaning for her.

A. friendly

B. well known

C. similar

A. They are originated by Area Border Router and are sent into a single area to advertise an Autonomous System Border Router.

B. They are originat ed by Area Border Routers and are sent into a single area to advertise destinations outside that area.

C. They are originated by the DR on every multi - access network. They include all attached routers including the DR itself.

D. They are originated by every router in the OPSF network. They include all routers on the link, interfaces, the cost of the link, and any known neighbor on the link.

A．Guangzhou Trade Fair is also called Canton Fair.

B．Guangzhou Trade Fair was established in the year 1957.

C．Guangzhou Trade Fair was held 3 times every year.

D．Guangzhou Trade Fair is known as the "NO. 1 Exhibition of China".

nown as cryptanalysis.Cryptanalytic attacks rely on the nature of the algorithm plus perhaps some knowledge of the general characteristics of the （） or even some sample plaintext-ciphertext pairs. This type of （） exploits the characteristics of the algorithm to attempt to deduce a specific plaintext or to deduce the key being used. If the attack succeeds in deducing the key, the effect is catastrophic: All future and past messages encrypted with that key are compromised. The second method, known as the （）-force attack, is to try every possible key on a piece of （） until an intelligible translation into plaintext is obtained. On average, half of all possible keys must be tried to achieve success.

A.stream B.symmetric C.asymmetric D.advancedA.operation B.publication C.plaintext D.ciphertextA.message B.knowledge C.algorithm D.attackA.brute B.perfect C.atribue D.re searchA.plaintext B.ciphertext C.sample D.code