Sidereal time is NOT used（）.

1、A sidereal day is shorter than a solar

A sidereal day is shorter than a solar day. This difference is due to（）.Airregularities in the daily rotational rate of the SunBthe space motion of the solar systemCthe precession of the equinoxesDthe use of different reference point

2、Time is money! We should（）our time.

Time is money! We should（）our time.Abe fit forBmake good use ofCplay a part ofDtake the place of

3、Which timing mode is appropriate for a

Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?（）ADUSBline timingCloop timingDinternal timingEthrough timing

4、Late fuel injection timing is indicate

Late fuel injection timing is indicated by （）Alower than normal cylinder pressure and low exhaust temperatureBlower than normal cylinder pressur...

5、Which timing mode is most appropriate

Which timing mode is most appropriate for an ONS 15454 that has lost its BITS-1 and optical references?（）Aline timingBloop timingCinternal timingDthrough timingEexternal timing

6、Which timing mode is

Which timing mode is appropriate for an SDH NE that is adjacent to an SDH N...