The set of the equatorial countercurrent is generally to the().
A、north
B、east
C、southwest
D、northwest
A、north
B、east
C、southwest
D、northwest
A、always be nearer to the equator B、always be nearer to the elevated pole C、be nearer to the pole in the Northern Hemisphere and nearer to the equator in the Southern Hemisphere D、be nearer to the pole or the equator depending on the latitudes of the arrival and departure positions
A、A.180E above the equator B、B.64.5 E over the IOR C、C.15.5W along the straight line D、D.55.5W above the equator
A、the lines of force cross the equator on a 0°-180°alignment B、the quadrantal error is 0° C、there is no vertical component of the Earth's magnetic field D、the intercardinal headings have less than 1°
A、is the dross of selfishness consumed; set free B、the dross of selfishness is consumed; setting free C、is the dross of selfishness consuming; sets free
A、The period of time in which the set point and the control point coincide B、The periodic change between the set point and the control point C、The variable difference between the set point and the control point D、The constant difference between the set point and the control point
A、A.the altitude above sea level B、B.the season of the year C、C.the latitude or distance from the equator D、D.All of the above
A、increases with latitude,being maximum at the geographic poles B、decreases with latitude,being maximum at the geographic equator C、is greatest when a vessel is near the Earth's magnetic equator D、remains the same at all latitudes
A、when the moon is new or full B、when the moon and sun have declination of the same name C、only when the moon and sun are on the same sides of the earth D、at the beginning of spring when the sun is over the equator
A、A. The DESCRIBE DEPT statement displays the structure of the DEPT table. B、B. The ROLLBACK statement frees the storage space occupies by the DEPT table. C、C. The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist. D、D. The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.