单选题Telneting from any machine on the network is taking 75 seconds.  Which of the following procedures should be checked to correct the error?（）ACheck  /etc/hosts. BCheck  /etc/resolv.conf. CCheck for packet errors. DCheck to see if the master server is up

A. is taking down

B. is taking out

C. is taking up

D. is taking back

The Turing machine is an abstract(71)of computer execution and storage introduced in 1936 by Alan Turing to give a mathematically precise definition of(72). or 'mechanical procedure'. As such it is still widely used in theoretical computer science, especially in(73)theory and the theory of computation. The thesis that states that Turing machines indeed capture the informal notion of effective or mechanical method in logic and mathematics is known as Turing's thesis.

Every Turing machine computes a certain(74)partial function over the strings over its alphabet. In that sense it behaves like a computer with a fixed program. However, as Alan luring already described, we can encode the action table of every Turing machine in a string. Thus we might try to construct a Turing machine that expects on its tape a string describing an action table followed by a string describing the input tape, and then computes the tape that the encoded Turing machine would have computed. As Turing showed, such a luring machine is indeed possible and since it is able to simulate any other Turing machine it is called a(75)Turing machine.

A universal Turing machine is Turing complete. It can calculate any recursive function, decide any recursive language, and accept any recursively enumerable language. According to the Church-Turing thesis, the problems solvable by a universal Turing machine are exactly those problems solvable by an algorithm or an effective method of computation, for any reasonable definition of those terms.

A．implement

B．pattern

C．tool

D．model

A、participating in

B、taking in

C、participating into

D、taking into

In view of ______ bilge water from any vessel，an application shall be made to Harbor Authorities for approval．

A.discharging

B.recircling

C.loading

D.taking in

A. user name

B. password length

C. certificate

D. Host Checker

The three players repeatedly denied _taking_ (take) any drug.

An internet is a combination of networks connected by (71) .When a datagram goes from a source to a (72) ，it will probably pass many (73) until it reaches the router attached to the destination network．A router receives a (74) from a network and passes it to another network．A router is usually attached to several networks．When it receives a packet，to which network should it pass the packet? The decision is based on optimization： Which of the available (75) is the optimum pathway?

A．modems

B．routers

C．switches

D．computers

A. for

B. on

C. of

D. in

A. Any routes learned by R2 from the interface tied to the 172.16.0.0 network will not be advertised to neighbors on the 192.168.2.0 network.

B. Only routes learned by R2 from the interface tied to the 172.16.0.0 network will be advertised to neighbors on the 192.168.2.0 network.

C. Only the 172.16.0.0 network will be advertised to neighbors on the 192.168.2.0 network.

D. All networks, except the 172.16.0.0 network will be advertised to neighbors on the 192.168.2.0 network .

You have water washed your cargo tanks using the fixed machines．What should you do before using portable machines to clean areas screened from the wash of the fixed machine by structural members ________．

A.Ventilate the tank to eliminate any electrostatically charged mist

B.Attach the water supply hose to the portable machine after the cleaning head is positioned inside the tank

C.Insure that the tanks are not stripped until the final wash is started

D.Ground the fixed machines to eliminate any electrostatic buildup on the cleaning head