Which syntax turns an existing constraint on?（）

A . Pack://application:,,,/myAssembly;component/MyFolder/myImage.jpg B . Pack://application:,,,/myAssembly;MyFolder/component/myImage.jpg C . Pack://application:,,,;component/myAssemby/MyFolder/myImage.jpg D . Pack://application:,,,/myAssembly;component/myImage.jpg

A . automatically as the liferaft inflates B . with a switch near the boarding handle C . at night because the light has a photosensitive switch D . by screwing the bulb in after the raft is inflated

A . open the indicator cocks B . supply some LO to cylinder liner wall with lubricator C . put the fuel handle in the "stop" position D . pump up the air bottle

A .  FREQ = MONTHLY； BYMONTHDAY = 31 B .  FREQ = MONTHLY； BYMONTHDAY = -1 C .  FREQ = DAILY； BYDAY = -1 D .  FREQ = MONTHLY； BYDAY = 31 E .  FREQ = DAILY； BYMONTHDAY = LAST_DAY

A . dbclean -object account -type obsolete -db dbname -days daysold B . dbclean -table account -type obsolete -db dbname -days daysold C . dbclean -object organization -type account -db dbname -days daysold D . dbclean -object user -type account -db dbname -days daysold

A . that B . it C . what D . there

A . Either the -a or flag -b may be used, but not both. B . If the flag -a is used then the flag -b also must be used. C . One of the -a or -b flags must be used, but not both at the same time. D . Both the flags may be used together, but neither are mandatory.

A . chvg -Qn testvg B . chlv -Qn testvg C . varyoffvg testvg； varyonvg -Qn testvg D . varyoffvg testvg； exportvg testvg； importvg -Qn testvg； varyonvg testvg

A . SELECT a.last_name, a.salary, a.department_id, b.maxsal FROM employees a, (SELECT department_id, max(salary)maxsal FROM employees GROUP BY department_id) b WHERE a.department_id = b.department_id AND a.salary < b.maxsal; B . SELECT a.last name, a.salary, a.department_id FROM employees a WHERE a.department_id IN (SELECT department_id FROM employees b GROUP BY department_id having salary = (SELECT max(salary) from employees)) C . SELECT a.last_name, a.salary, a.department_id FROM employees a WHERE a.salary = (SELECT max(salary) FROM employees b WHERE a.department _ id = b.department _ id); D . SELECT a.last_name, a.salary, a.department_id FROM employees a WHERE (a.department_id, a.salary) IN (SELECT department_id, a.salary) IN (SELECT department_id max(salary) FROM employees b GROUP BY department_id ORDER BY department _ id)

A . ALTER TABLE table_name ENABLE constraint_name; B . ALTER TABLE table_name STATUS = ENABLE CONSTRAINT constraint _ name; C . ALTER TABLE table_name ENABLE CONSTRAINT constraint _ name; D . ALTER TABLE table_name TURN ON CONSTRAINT constraint _ name

A . chvg -Qn testvg B . chlv -Qn testvg C . varyoffvg testvg； varyonvg -Qn testvg D . varyoffvg testvg； exportvg testvg； importvg -Qn testvg； varyonvg testvg

A .https://assets.asklib.com/images/image2/2018080116405368499.jpg B .https://assets.asklib.com/images/image2/2018080116405773977.jpg C .https://assets.asklib.com/images/image2/2018080116410160098.jpg D .https://assets.asklib.com/images/image2/2018080116410455360.jpg

A . ifconfig B . no C . chdev D . netstat

A . <%@ PreviousPageType VirtualPath ="~/MyPage.aspx"% > B . <%@ PreviousPageType VirtualPath ="/MyPage.aspx/ ~"% > C . <%@ PreviousPageType VirtualPath ="~/MyPage.master"% > D . <%@ PreviousPageType VirtualPath ="~/MyPage"% &gt

A . The local file： /etc/.netrc B . The remote file： ~/ .rhosts C . The securetcpip command D . The remote file： /etc/hosts.equiv

A . too low starting air pressure B . main starting valve closed C . neither A nor B D . A and B

A . to open B . opening C . open D . opened

A、Rate of turn B、Angle of attack C、True airspeed