Sidereal time is used by navigators when（）...

第1题

[单选题] Sidereal time is NOT used（）.

A、as the basis for star charts B、to enter a star finder C、in sight reduction using Pub 249 D、in sight reductions of planet observations

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第2题

[单选题] The approximate positions of the stars are based on sidereal time，which is based upon rotation of the Earth relative to（）.

A、winter solstice B、autumnal equinox C、summer solstice D、vernal equinox

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第3题

[单选题] Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?（）

A、DUS B、line timing C、loop timing D、internal timing E、through timing

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第4题

[单选题] A BGP connection is being established.What happens if the local router and the peer router do NOT have the same hold-time value configured?（）

A、The BGP session does not establish. B、The hold time is assumed to be infinite. C、The larger of the two hold-time values is used. D、The smaller of the two hold-time values is used.

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第5题

[单选题] A sidereal day is shorter than a solar day. This difference is due to（）.

A、irregularities in the daily rotational rate of the Sun B、the space motion of the solar system C、the precession of the equinoxes D、the use of different reference points

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第6题

[单选题] A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）

A、The motion of the apparent sun is along the ecliptic B、Measurement of time is along the celestial equator C、The speed of the Earth's revolution is not constant D、There are variations in the Earth's rotational speed

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第7题

[单选题] Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.

A、97 times greater B、94 times greater C、10 times greater D、2 times greater

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第8题

[多选题] You are using the control file to maintain information about the database backups that are being performed by Recovery Manager (RMAN). Identify two scenarios is which you must have a recovery catalog.（）

A、To store the backup information of multiple database B、To restrict the amount of space that is used by the backups C、To maintain a backup for a certain time is set by the CONTROL_FILE_RECORD_KEEP_TIME parameter. D、To list the data files that were in a target database at a given time by using the AT option of REPORT SCHEMA command.

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第9题

[多选题] You are using the control file to maintain information about the database backups that are being performed by Recovery Manager (RMAN).Identify two scenarios is which you must have a recovery catalog. （）(Choose two.)

A、To store the backup information of multiple database B、To restrict the amount of space that is used by the backups C、To maintain a backup for a certain time is set by the CONTROL_FILE_RECORD_KEEP_TIME parameter. D、To list the data files that were in a target database at a given time by using the AT option of REPORT SCHEMA command.

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Sidereal time is used by navigators when（）.

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