Centrifugal
Gear
Piston
Vane
第1题：
When you find you make a mistake in the chat room, what should you do?
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第2题：
What causes cavitation in a centrifugal pump ________．
A.Vapor pockets in the flow stream
B.Rough impeller surfaces
C.Worn wearing rings
D.Heavy fluid in the flow stream
第3题：
A:( ), David? B:An orange juice.
A. What do you like
B. What would you like
C. Would you like an orange juice
第4题：
If you find errors in the view V$DATABASE_BLOCK_CORRUPTION with a status of MEDIA_CORRUPT， what RMAN command would you run to correct the problem？（）
第5题：
W are sure that you will find a ready sale ____ this type of new product.
第6题：
It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong direction. This would cause the pump ______.
A.head capacity to improve
B.discharge to be reversed
C.efficiency to decrease
D.slippage to decrease
第7题：
You are at a client site. It is a medium-sized business and needs a Cisco Catalyst switch that offers high availability and security. What type of Catalyst switches would you recommend？（）
第8题：
why do you need to take the lube oil sample for analysis ? in the analyzing , what can you possibly find ?and if you find these substances ,what are the possible problems the engines may have ?why ?
第9题：
You are speaking to an IT manager with 350 small servers. The IT manager is looking to reduce and consolidate systems. What strategy would you follow？（）
第10题：
Oil is discharged from the impeller through the outlet
Gravity causes the oil to flow toward the discharge
The self-priming feature of the centrifugal pump enables it to draw its own suction as it starts
The discharge capacity varies directly with the speed of the impeller