The (75)is designed specifically as a security system for preventing unauthorized communications between one computer network and another computer network.(75)A.firewall

B．protocol

C．hacker

D．virus

[单选题] （75） are designed to manage large bodies of information.(75)A． I/O portsB． PrintersC． Database systemD． Keyboards

[单选题]A．) particularlyB．) specificallyC．) apparentlyD．) virtually

[单选题]The Programming languages are designed to (73) the communication between human and computers.(73) A．makeB．facilitateC．enableD．1et

[单选题]（）is the Internet commerce designed for direct communications and commercial relationship between a firmand its end customer.A .B2CB .B2BC .B2AD . D.A2B

[单选题]A thrust block is designed to（）.A . absorb the shock of wave pressure at the bowB . be placed between the engines and the foundation to absorb the vibrationC . transmit the thrust of the engine to the propellerD . transmit the thrust of the propeller

[单选题]A firewall is a (71) system designed to (72) an organization′s network against threats.(71) A．operatingB．programmingC．securityD．data(72) A．preventB．protectC．examineD．exploit

[单选题]SMS was originally designed as part of ( )，but is now available on a wide range of networks ，including 3G and 4G networks.A．PHS B.AMPS C.GSM D.GPRS

[试题]B．ut the hardware is designed to use even（）power than other schemes， making it especially appropriate for such things as RFID tags， which must work for years（）any external power source.A．most B．more C．less D．otherA．with B．without C．as D．than

[单选题]A firewall is a (68) system designed to (69) all organization,s network aga-inst threats.(68) A．operatingB．programmingC．securityD．service(69) A．preventB．protectC．developD．exploit

[单选题]Load line regulations are designed to insure that a vessel has adequate structural strength and sufficient（）.A . lifesaving equipmentB . stabilityC . mooring tensionD . riser tensio