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结构混凝土的强度等级必须符合设计要求。用于检查结构构件混凝土强度的试件，应在混凝土的浇筑地点随机抽取。取样与试件留置应符合下列()规定。

A.每拌制100盘且不超过100m3的同配合比的混凝土，取样不得少于一次

B.每工作班拌制的同一配合比的混凝土不足100盘时，取样不得少于一次

C.当一次连续浇筑超过1000m3时，同一配合比的混凝土每200m3取样不得少于3次

D.每一楼层、同一配合比的混凝土，取样不得少于3次

E.每次取样应至少留置一组标准养护试件，同条件养护试件的留置组数应根据实际需要确定

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第1题

A technician is reporting wireless transmission speeds of 300Mbps. Which of the following wireless standards is being used?()

A.802.11a

B.802.11b

C.802.11g

D.802.11n

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第2题

Which of the following technologies can detect and fix single bit memory errors?()

A. RAID

B. Registered memory

C. SDRAM

D. ECC

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第3题

Which of the following devices would need to be configured to block specific ports and protocols from entering the network?()

A. Bridge

B. Firewall

C. Port replicator

D. Gateway

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第4题

Which of the following is a storage system that can be connected to multiple servers through an iSCSI connection?()

A. JBOD

B. DAS

C. NAS

D. SAN

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第5题

A new company has been given one public IP address. The company employs 200 users requirin

g Internet access from the headquarters.Which of the following can be implemented to provide Internet access for all the employees?（）

A. Multicasting

B. Proxy server

C. NAT

D. Subnetting

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第6题

Anetworkadministratorofacompanyhasmanybranchlocationseachusingasubnetmaskof255.255.255.224.Whichofthefollowingdynamicroutingprotocolsshouldbeused?()

A.IPv6

B.RIP

C.IGRP

D.RIPv2

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第7题

Which of the following connector interfaces is MOST likely used to connect several peripheraldevices such as printers, digital cameras, and scanners?()

A.Parallel

B.USB

C.Fibre

D.SATA3

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第8题

An administrator is unable to ping a workstation. Which of the following tools would BEST help toresolve the issue?()

A. Cable tester

B. Multimeter

C. Toner probe

D. Protocol analyzer

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第9题

Which of the following interfaces are used to simultaneously transfer video and audio at highrates?()

A.HDMI

B.DVI-D

C.S-Video

D.DVI-I

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第10题

Auserisunabletoconnecttothenetwork.Anetworktechnicianisabletodeterminethatthereisaproblemo

ntheswitch.Allotherusersonthatswitchareabletoconnectsuccessfullytothenetwork.Whichofthefollowingisaprobablecause？（）

A.Switchingloopisoccurringontheswitch.

B.Wrongsubnetmaskontheswitch.

C.IncorrectSNMPsettingsontheswitch.

D.Portismisconfiguredontheswitch.

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