How is “radio silence” imposed?（）

A . She is not very well. B . She is years old. C . She is very nice. D . She is as tall as I am.

A . It ignores duplicates. B . It prevents character set translation on import. C . It allows rows to be inserted into a table that already exists. D . It ignores storage parameters in the DML executed during import.

A . After determining that the frequency or channel appears to be no longer in use B . After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications C . After the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded D . Routine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communicatio

A . After determining that the frequency or channel appears to be no longer in use B . After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications C . Routine communications can resume after the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded D . If，in the Master's opinion，communications on that frequency will interfere with emergency communicatio

A . Fresnel units B . decibels C . EIRP D . milliamperes E . ohm

A . He is tall and beautiful B . He is very strict with us C . He is fine D . He is in an expensive car

A . To ensure that interference to proprietary communications is minimized B . To ensure that only voice communications can be effected on the distress frequency or channel C . To ensure that a distressed vessel will have a "window" twice each hour for transmitting routine messages D . To ensure that interference on a particular frequency or channel to communications concerning emergency traffic is minimized

A . I don't think so B . In fact he isn't C . Thank you D . You are not true

A . Ten o'clock. B . Ten yuan a kilo. C . I like it very much. D . I don't like.

A . Not at all B . It was nothing C . It doesn't matter. D . Just so so.

A、description B、narration C、exposition D、argumentation

A．how is she B．where is she C．how she is D．where she is

A．To measure amounts of rainfall. B．To check the accuracy of scales. C．To observe changes in the atmosphere. D．To calculate the density of other metals.

A．It's $14.99. B．It's $40.99. C．It's $14.19.

A．Ten dollars. B．Five dollars. C．Fifteen dollars.

A．She is in. B．She feels happy. C．She is sad.

A.C2 for a particular cell must be larger than zero for a mobile to be allowed to camp on that cell B.C2 is a quality check and if not fulfilled, the idle mobile must try another cell to camp on C.C2 and BSIC are reported to the serving cell, at least, once every five seconds to enable network controlled cell re-selection D.At cell re-selection, the cell with the largest derived C2 is chosen to camp on E.C2 is set to yes, if both CB and CBQ are low

A．A.I don&39;t think so. B．B.Thank you. C．C.You are not tru D．D.In fact it isn&39;t.