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单选题
Which of the following descriptions best identifies the operating principal of a flash-type evaporator?（）
A
Sea water is heated to boiling temperature while under a vacuum
B
Sea water is passed over heated plates in a thin film
C
Heated sea water is injected into a vacuum chamber
D
Sea water is forced through a heated eductor
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Which descriptions below are true about Stephen Hawking?()
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Which of the following is BEST for providing network security?()
A.FirewallB.DMZC.SwitchD.IDS
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Which of the following descriptions about IP spoofing is correct？（）A、IP source address is forgedB、IP destination address is forgedC、IP TCP source port is forgedD、IP TCP destination port is forgedE、None of above
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Which set of classes correctly identifies the four traffic classes， from highest priority to lowest priority， specified in the 802.11e standard？（）A、 gold， silver， bronze， and platinumB、 platinum， gold， silver， and bronzeC、 titanium， gold， silver， and bronzeD、 voice and video， best effort， background， and scavengerE、 voice， video， best effort， and backgroundF、 voice， video， best effort， and scavenger
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Which two statements about the best effort model for QoS are true？（）A、delay sensitive packets are given preferential treatmentB、the default policy identifies a delay sensitive class and default classC、the default policy identifies a delay sensitive class， best effort class， and default classD、the model is highly scalableE、the model is still predominant on the internet F the model provides guaranteed service
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Which of the following is BEST for providing network security?（）A、FirewallB、DMZC、SwitchD、IDS
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Which of the following connectors identifies that a motherboard has onboard video capabilities？（）A、DB-15B、DB-9C、DB-25D、RJ-45E、DVI
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单选题With respect to centrifugal pump impellers, which of the following descriptions represents the correct centrifugal pump classification? （）A
Single stage or multistageB
High pressure or low pressureC
Open or close coupledD
Horizontal or vertical
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单选题Which of the following descriptions about IP spoofing is correct？（）A
IP source address is forgedB
IP destination address is forgedC
IP TCP source port is forgedD
IP TCP destination port is forgedE
None of above
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The SGA Tuning AdvisorB
The SQL Access AdvisorC
The SQL Tuning AdvisorD
The Memory Advisor
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多选题Which two statements about the best effort model for QoS are true？（）Adelay sensitive packets are given preferential treatmentBthe default policy identifies a delay sensitive class and default classCthe default policy identifies a delay sensitive class， best effort class， and default classDthe model is highly scalableEthe model is still predominant on the internet F the model provides guaranteed service
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单选题Which set of classes correctly identifies the four traffic classes， from highest priority to lowest priority， specified in the 802.11e standard？（）A
gold， silver， bronze， and platinumB
platinum， gold， silver， and bronzeC
titanium， gold， silver， and bronzeD
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voice， video， best effort， and backgroundF
voice， video， best effort， and scavenger
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多选题Which of the following connectors identifies that a motherboard has onboard video capabilities？（）ADB-15BDB-9CDB-25DRJ-45EDVI
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单选题Which of the following best describes the age of the data in an OLTP system?（）A
CurrentB
ProjectedC
HistoricalD
Current and projected
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