A signal indicating zone time is preceded with the letter ______.A.LB.NC.TD.Z
A signal indicating zone time is preceded with the letter ______.
A.L
B.N
C.T
D.Z
相关考题：
Which of the following datatypes store time－zone information in the database?() A. TIMESTAMPB. DATEC. TIMESTAMP WITH TIME ZONED. TIMESTAMP WITH LOCAL TIME ZONEE. DATETIME
An analog signal's characteristic quantity representing data may 66). at any instant, any value within a continuous(67). For example, an analog signal may follow continuously the values of another physical quantity representing data.A discrete signal is composed of(68)elements in time, each element having one or more characteristic quantities which can represent data. Examples of characteristic quantities are amplitude, waveform,(69), and position in time. A digital signal is a special case of discrete signals, in which data are represented by a(70)number of well-defined discrete values that one of its characteristic quantities may take in time.A．acquireB．collectC．assumeD．fetch
A signal indicating Greenwich mean time would be preceded with ______.A.a code hoist to indicate Greenwich mean time to followB.the letter GC.the letters GTD.the letter Z
If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the ______．A.Skip zoneB.Blackout zoneC.Diffraction zoneD.Shadow zone
If you are on the beach and are signaling to a small boat in distress that your present location is dangerous and they should land to the left，you would ______．A.fire a green star to the leftB.send the letter K by light and point to the leftC.place an orange signal to your left as you signal with a white lightD.send the code signal S followed by L
An orange flag showing a black circle and square is a ______.A.signal indicating a course changeB.distress signalC.signal of asking to communicate with another vesselD.signal indicating danger
Which of the following datatypes store time-zone information in the database？（）A、 TIMESTAMPB、 DATEC、 TIMESTAMP WITH TIME ZONED、 TIMESTAMP WITH LOCAL TIME ZONEE、 DATETIME
You issued the following command at the UNIX environment： % setenv ORA_SDTZ ’OZ_TZ’ What will be the impact of issuing the above command？（） A、 The operating system local time zone will be set for a user session using the operating system environment variable.B、 The database local time zone will be set for a user session using the operating system environment variable.C、 The operating system local time zone will be set for the database using the operating system environmentD、 The database local time zone will be set for the database using the operating system environment variable.
单选题Your Oracle10g database contains a table with a TIMESTAMP TO LOCAL TIME ZONE column. There are about two hundred column values for the column. You issued the following statement： SQL ALTER DATABASE SET TIME_ZONE =’Europe/London’； What will be the result of issuing the above statement？（）A The statement will be executed successfully， and a new time zone will be set for the database.B The statement will be executed successfully， but a new time zone will not be set for the database.C The statement will not be executed successfully because the SET TIME_ZONE clause can be used only with the ALTER SESSION statement.D The statement will not be executed successfully because the ALTER DATABASE SET TIME_ZONE statement is used only when the database contains no table with the TIMESTAMP TO LOCAL TIME ZONE column.
单选题Which of the following datatypes store time-zone information in the database？（）A TIMESTAMPB DATEC TIMESTAMP WITH TIME ZONED TIMESTAMP WITH LOCAL TIME ZONEE DATETIME
单选题Which of the following datatypes store time-zone information in the database?（）ATIMESTAMPBDATECTIMESTAMP WITH TIME ZONEDTIMESTAMP WITH LOCAL TIME ZONEEDATETIME
单选题You issued the following command at the UNIX environment： % setenv ORA_SDTZ ’OZ_TZ’ What will be the impact of issuing the above command？（）A The operating system local time zone will be set for a user session using the operating system environment variable.B The database local time zone will be set for a user session using the operating system environment variable.C The operating system local time zone will be set for the database using the operating system environmentD The database local time zone will be set for the database using the operating system environment variable.
单选题If you are on the beach and are signaling to a small boat in distress that your present location is dangerous and they should land to the left，you would（）.Afire a green star to the leftBsend the letter K by light and point to the leftCplace an orange signal to your left as you signal with a white lightDsend the code signal S followed by L
单选题What does a SART signal sound or look like?（）AIt transmits SOS and the vessel's name and position in slow speed Morse CodeBIt will appear on a radar unit's PPI as a line of dots radiating outward with the innermost dot indicating the SART's positionCIt will appear on a radar unit's PPI as a line of dots radiating outward with the outermost dot indicating the SART's positionDNone of the above
单选题If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.ASkip zoneBBlackout zoneCDiffraction zoneDShadow zone
单选题Daylight savings time is a form of zone time that adopts the time（）.Aone zone to the eastBone zone to the westCtwo zones to the eastDtwo zones to the west
单选题You created the ORDERS table in your database by using the following code： SQL CREATE TABLE ORDERS （ORDER_DATE TIMESTAMP（0） WITH TIME ZONE）； Then， you inserted data in the ORDERS table and saved it by issuing the following statements：SQL INSERT INTO ORDERS VALUES（’18-AUG-00 10：26：44 PM America/New_York’）； SQL INSERT INTO ORDERS VALUES（’23-AUG-02 12：46：34 PM America/New_York’）； SQL COMMIT； Next， you issued the following statement to change the time zone for the database： SQL ALTER DATABASE SET TIME_ZONE=’Europe/London’； What will be the result of executing the above statement？（）A The statement will fail.B The statement will be executed successfully， and the new time zone will be set for the database.C The statement will be executed successfully， but the new time zone will be set for the current session.DThe statement will be executed successfully， but the new time zone will neither be set for the database nor for a specific session.
多选题The current time zone for one of the user sessions is set to the database local time zone. For one application， the user session requires the time zone to be set to the local operating system time zone without affecting other user sessions. Which two solutions could the user implement to achieve this objective？ （）Ause the ALTER SYSTEM command to change the time zoneBuse the ALTER SESSION command to change the time zoneCuse the ALTER DATABASE command to change the time zoneDset the value for the operating system variable ORA_SDTZ on the client machineEset the value for the operating system variable ORA_SDTZ on the database server machine
单选题A vessel sounding a fog signal of one short，one prolonged，and one short blast is indicating that the vessel is（）.AfishingBin distressCat anchorDnot under command
单选题A 95-meter vessel aground sounds which fog signal? （）AA rapid ringing of a bell for 5 seconds every two minutesBA whistle signal of one short，one prolonged，and one short blastCA prolonged blast of the whistle at intervals not to exceed one minuteDA rapid ringing of a bell for 5 seconds，preceded and followed by three separate and distinct strokes on the bell
单选题A man aboard a vessel，signaling by raising and lowering his outstretched arms to each side，is indicating（）.Adanger，stay awayBall is clear，it is safe to passCall is clear，it is safe to approachDa distress signal
单选题A man aboard a vessel，signaling by raising and lowering his outstretched arms to each side，is indicating（）.Adanger，stay awayBall is clear，it is safe to passCthe vessel is anchoredDa distress signal
单选题The lifesaving signal indicating You are seen - assistance will be given as soon as possible is the（）.Avertical motion of white flagsBvertical motion of a white light or flareCfiring of a green star signalDNone of the above
单选题A signal indicating zone time is preceded with the letter（）.ALBNCTDZ