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姜黄素分光光度法测定水中硼，水样中硝酸盐氮含量大于（）mg/L时，产生干扰，必须除去。

A. 10
B. 15
C. 20
D. 25

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AnewBackupConnectionisbeingdeployedonaremotesiterouter.thestabilityoftheconnectionhasbeenaconcern.inordertoprovidemoreinformationtoEIGRPRegardingthisinterface，Youwishtoincorporatethe"Reliability"costmetricintheEIGRPCalculationwiththecommandmetricweights10101.WhatimpactwillthismodificationontheremotesiterouterhaveforotherexistingEIGRPneighborshipsfromthesameEIGRPDomain？（）

A. ExistingNeighborswillimmediatelybeginusingthenewmetric.
B. ExistingNeighborswillusethenewmetricafterclearingtheEIGRPNeighbors.
C. ExistingNeighborswillresync，maintainingtheneighborrelationship
D. Allecistingneighborrelationshipswillgodown

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Whichtwocommandsarerequiredtoenablemulticastonarouter，knowingthatthereceiversonlysupportsIGMPv2？（）

A. IPPIMRP-address
B. IPPIMssm
C. IPPIMSparse-mode
D. IPPIMPassive

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SelectthethreebestanswerswhichbestdescribePrivateNetwork-toNetworkInterface（PNNI）inanATM network.（）

A. ItistheRoutingprotocolusedbetweenATMswitches
B. PNNIusesthesameDijsktraalgorithmforSPFcalculation
C. PNNIandOSPFusethesameDatabasetomakecohesivedecisionforpacketforwarding
D. PNNImeasureslinecapacitiesanddelaysinadditiontosimplecostmetrics

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2，3二氨基萘荧光法测定水中硒时，荧光物质的形成操作为：向消解的溶液中加入10mlNa.2EDTA，盐酸羟胺和甲酚红混合试剂，溶液呈桃红色，用（）调节至淡橙色。

A. 氨水
B. 氢氧化钠
C. 盐酸
D. 硝酸

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姜黄素分光光度法测定水中硼，水样中硝酸盐氮含量大于（）mg/L时，产生干扰，必须除去。

A. 10 B. 15 C. 20 D. 25

Whichtwocommandsarerequiredtoenablemulticastonarouter，knowingthatthereceiversonlysupportsIGMPv2？（）

SelectthethreebestanswerswhichbestdescribePrivateNetwork-toNetworkInterface（PNNI）inanATM network.（）

2，3二氨基萘荧光法测定水中硒时，荧光物质的形成操作为：向消解的溶液中加入10mlNa.2EDTA，盐酸羟胺和甲酚红混合试剂，溶液呈桃红色，用（）调节至淡橙色。

A. 10
B. 15
C. 20
D. 25