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单选题When it is necessary to open a refrigeration system for repairs and the system will be open for more than a few minutes, the open ends of the system should be （）.A dehydratedB purgedC pluggedD evacuated
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填空题当在Domino邮件服务器采用前转方案时，Domino必须是（）。
单选题When a refrigeration compressor is in the ‘off’ cycle, the thermal expansion valve will（）.A always be wide open when the compressor restartsB continue to operate as if the system were in operationC remain open until evaporator pressure equalizes, then close until the compressor restartsD always be completely closed until the compressor restarts
单选题Which of the following provides an integrated development environment for building XPages applications？（）A Lotus Domino Messaging ExpressB Lotus Domino AdministratorC Lotus Domino DesignerD Lotus Collaboration Express
单选题When starting a centrifugal pump, the discharge valve should be （）.A closedB opened fullyC cracked openD partly open
单选题A circuit breaker and a fuse have a basic similarity in that they both （）.A can be reset to energize the circuitB should open the circuit when overloadedC will burn out when an over current flow developsD All of the above
单选题RMAN enables you to open the target database when it is already mounted. Which command must you execute at the RMAN prompt to open the database？（）A ’SQL ALTER DATABASE OPEN’；B SQL ALTER DATABASE ’OPEN’；C OPEN DATABASE；D DATABASE OPEN
