Using a telescope, Galileo discovered stars that were____to the naked eye.

A .  decrypts the received MAC using a secret key B .  compares the computed MAC vs. the MAC received C .  authenticate the receivedmessage using the sender’s public key D .  look up the sender’s public key E .  extracts the MAC from the receivedmessage thenencrypts the received message with a secret keyto producethe MAC F .  Computes the MAC using the receivedmessage and a secret key as inputs to the hash functio

A . Executing password recovery is required. B . The virtual terminal lines are misconfigured. C . Use Telnet to connect to RouterA and then to NewSwitch to correct the error. D . Power cycle of NewSwitch will return it to a default configuration.

A . RSVP that signals QoS requests per individual flow B . not scalable to large implementations C . admission control not supported D . use of dynamic port numbers  E . UDP not supported

A . Executing password recovery is required. B . The virtual terminal lines are misconfigured. C . Use Telnet to connect to RouterA and then to NewSwitch to correct the error. D . Power cycle of NewSwitch will return it to a default configuration.

A . STP root status B . VTP mode C . Negotiation status D . Management domain E . Configuration revision number

A . true bearings B . magnetic bearings C . gyro bearings D . relative bearing

A . only anchor in the separation zone B . cross a traffic lane at as small an angle as possible C . avoid anchoring in areas near the termination of the scheme D . utilize the separation zone for navigating through the scheme if she is impeding other traffic due to her slower speed

A . 中国于2003年9月加入“伽利略计划” B . 是主要设计作军事用途的卫星导航系统 C . 是欧盟一个正在建造中的卫星定位系统 D . 它运行的轨道比GPS高

A . 正确 B . 错误

A . Plotting radio bearings over a long distance B . Determining latitude and longitude of a fix C . Measuring rhumb line distances D . Measuring rhumb line directio

A . it increases the likelihood of collision between the towing vessel and the disabled vessel B . recreational boaters tend to make the heaving line fast to the towed vessel as if it were the towline C . the monkey fist may injure someone D . it may reduce the catenary and increase yawing

A . put back in service if some CO remains B . hydrostatically tested C . retagged D . recharged

A . decreases the amount of flows   B . collects information about callers to agents   C . creates a framework for CRS Server status reporting  D . decreases latency through increased bandwidth on CRS Server   E . provides more efficient management of flows that are called by multiple other flow

A . A packet is delivered to Cisco WLC and forwarded via multicast to all of its associated APs, and finally to all wireless clients of that Cisco WLC, via wireless multicast. B . A packet is delivered to Cisco WLC and forwarded via unicast to all of its associated APs, and finally to all wireless clients of that Cisco WLC, via wireless unicast. C . A packet is delivered to Cisco WLC and forwarded via multicast to all of its associated APs, discarded at APs without SSID_X joined wireless clients, and forwarded at APs with SSID_X joinedwireless clients via wireless multicast. D . A packet is delivered to Cisco WLC and forwarded via unicast to all of its associated APs, discarded at APs without SSID_X joined wireless clients, and forwarded at APs with SSID_X joined wireless clients via wireless multicast. E . A packet is delivered to Cisco WLC and forwarded via multicast to all of its associated APs, discarded at APs without SSID_X joined wireless clients, and forwarded at APs with SSID_X joinedwireless clients via wireless unicast. F . A packet is delivered to Cisco WLC and forwarded via unicast to all of its associated APs, discarded at APs without SSID_X joined wireless clients, and forwarded at APs with SSID_X joined wireless clients via wireless unicast.

A．was one way of testing Einstein"s general theory of gravity. B．illustrated the insignificance of mass and composition of an object. C．acted as a well-known example to testify the equivalence principle. D．showed that all objects on Earth Were influenced by gravity.

A．A.Having seen B．B.Seen C．C.Seeing D．D.When seeing

A．a pamphlet that deals with slavery system B．a book of adventures for children C．a book of children's literature that deals with slavery issues D．a newspaper that expresses the opinions of politicians in Britain

有如下程序： include＜iostream＞ using namespace std; class A { public: A(){cout＜＜"A";} }; classB{public:B(){cout＜＜"B";}} classC:public A{ B b; public: C(){cout＜＜"C";} }; int main(){ C obj; return 0;} 执行后的输出结果是()。 A．CBA B．BAC C．ACB D．ABC

有如下程序： include＜iostream＞ using namespace std; class A { public: A(){cout＜＜"A";} ～A(){cout＜＜"～A";} }; class B:public A { A*p; public: B(){cout＜＜"B";p=new A;} ～B(){cout＜＜"～B";delete p;} }; int main() { B obj; return 0; } 执行这个程序的输出结果是()。 A．BAA～A～B～A B．ABA～B～A～A C．BAA～B～A～A D．ABA～A～B～A