Rule 14 describes the action to be taken by vessels meeting head-on. Which of the following conditions must exist in order for this rule to apply？______.

A . in restricted visibility B . between dusk and dawn C . in heavy traffic D . All of the above

A . The DESCRIBE DEPT statement displays the structure of the DEPT table. B . The ROLLBACK statement frees the storage space occupies by the DEPT table. C . The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist. D . The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.

A . The DESCRIBE DEPT statement displays the structure of the DEPT table. B . The ROLLBACK statement frees the storage space occupied by the DEPT table. C . The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist. D . The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.

A . subject to B . subjects to C . subjects D . is subject to

A . Both vessels must be power-driven B . They must be meeting on reciprocal or nearly reciprocal courses C . The situation must involve risk of collision D . All of the above

A . Routing information received through an IBGP session is not forwarded to another IBGP neighbor， onlyto EBGP neighbors B . Routing information received through an EBGP session is not forwarded to another EBGP neighbor，only to IBGP neighbors C . BGP neighbor peerings are established and sychronized using the TCP 3-way handshake D . BGP shall not advertise a route until that route has been learned via an IGP also

A . The DESCRIBE DEPT statement displays the structure of the DEPT table. B . The ROLLBACK statement frees the storage space occupies by the DEPT table. C . The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist. D . The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.

A . A BGP router can only advertise an EBGP learned route， provided that the route is an IGP route in the routing table. B . A BGP router can only advertise an IBGP learned route， provided that the route is an IGP route in the routing table. C . A BGP router can only advertise an IBGP learned route， provided that the route is an IGP route that is not in the routing table. D . A BGP router can only advertise an EBGP learned route， provided that the route is a metric of 0 in the BGP table.

A . Only router can split boundaries(horizons)between concentric networks. B . All distance vector protocols require fall routes that may cause momentary loops as the topology changes. C . Networks can only remain fully converged if all information about routes is sent out all active interfaces. D . Information about a route should not be sent back in the direction from which the original update came. E . Each AS must keep routing tables converged to prevent dead routes from being advertised across the AS boundary.

A . 20 percent of the traffic on a network segment should be local. B . no more than 20 percent of the network traffic should be able to move across a backbone. C . no more than 80 percent of the network traffic should be able to move across a backbone. D . 80 percent of the traffic on a network segment should be local.

A、Do not give liquor as presents. B、Be sure that your gift does not require too much attention. C、Be modest with your gift. D、Be careful in giving alcoholic drinks.

A:正确; B:错误

A．Y B．N C．NG

A．foresee B．accept C．exclude D．foretell

The sentence "You might tolerate the odd road-hog...the rule." (Para. 1) implies that ______ . A．our society is unjust towards well-mannered motorists B．rude drivers can be met only occasionally C．the well-mannered motorist cannot tolerate the road-hog D．nowadays impolite drivers constitute the majority of motorists

A．barons B．freemen C．Villeins D．lawyers

A．It can help people consciously switch between tasks. B．It doesn"t take as much time as the stage of goal shifting. C．People will use similar rules while performing different tasks. D．It can help explain why time is lost during task switching.

A．external B．permanent C．intermittent D．simultaneous

A. The DESCRIBE DEPT statement displays the structure of the DEPT table. B. The ROLLBACK statement frees the storage space occupies by the DEPT table. C. The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist. D. The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.

A．RuleUtilitarianism． B．Kant’sCategoricalImperative C．Kant’sreversibilitycriterion． D．theGreatestHappinessPrincipl