Which antenna generally has the narrowest first Fresnel zone

题目
单选题
Which antenna generally has the narrowest first Fresnel zone in both the horizontal and verticalplanes?()
A

omnidirectional

B

patch

C

Yagi

D

sector

E

parabolic dish

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相似问题和答案

第1题:

听力原文:If a customer informs his bank that a draft which has been issued to him has been lost, the drawee bank should be noticed immediately.

(8)

A.The customer should first notify the drawee bank of the loss of his draft.

B.The customer should first notify the drawer bank of the loss of his draft.

C.The customer should first notify the remitting bank of the loss of his draft.

D.The customer should first notify the collecting bank of the loss of his draft.


正确答案:B
解析:单句意思为“当客户丢失了银行开给他的汇票,则应立即通知付款行。”

第2题:

Which security or functional zone name has special significance to the Junos OS?()

A. self

B. trust

C. untrust

D. junos-global


参考答案:D

第3题:

Which bag has the __________ (much) rice,the first,the second or the third?


正确答案:
33. most

第4题:

The state of Maine generally has cooler temperatures than( ).

A.there are most other states
B.most other states which have
C.most other states have
D.having most other states

答案:C
解析:
该题考查句子结构。从题干及选项可以看出,空格处要填的内容是与Maine州的气温做比较,根据一致原则排除A、D选项,B不符合定语从句构成,故答案为C。

第5题:

When several salvors are on-scene at the same time to assist a vessel that has not been abandoned,which principal governs the decision as to which one's services will be accepted ________.

A.The Master of the ship needing assistance has the absolute right to decide

B.The first salvor on-scene has the prior claim providing he has adequate facilities to assist the vessel needing assistance

C.The salvors must agree to a division of any salvage among themselves with the major share allotted to those doing the most work

D.The first salvor on-scene has the absolute right to provide assistance;however,he is liable if the ship is lost due to his lack of experience,equipment,etc


正确答案:A

第6题:

In the Junos OS, which statement is true?()

A. vlan.0 belongs to the untrust zone.

B. You must configure Web authentication to allow inbound traffic in the untrust zone.

C. The zone name "untrust" has no special meaning.

D. The untrust zone is not configurable.


参考答案:C

第7题:

A technician has a PC that has no Internet connection. The IP address for the PC is 169.254.XXX.XXX. Which of the following should be checked FIRST?()

A. DHCP settings

B. BIOS settings

C. DNS settings

D. Power settings


参考答案:A

第8题:

Which invention has generated difficult puzzles for scientists, politicians, and philosophers?

A、Theory of Relativity

B、the splitting of the atom

C、the first space flight

D、Dolly's appearance


参考答案:ABCD

第9题:

Your ARPA has two guard zones.What is the purpose of the inner guard zone ________.

A.Alert the watch officer that a vessel is approaching the preset CPA limit

B.Warn of small targets that are initially detected closer than the outer guard zone

C.Guard against target loss during critical maneuvering situations

D.Sound an alarm for targets first detected within the zone


正确答案:B

第10题:

Construction of a new automobile parts manufacturing facility has recently been completed. Thefacility IT manager wants to deploy voice over WLAN. During your initial walkthrough, you observenumerous highly reflective surfaces on the manufacturing equipment and in the buildingconstruction itself. What potential problem exists that should be accounted for during your sitesurvey?()

  • A、LOS modulation
  • B、Multipath distortion
  • C、RF signal absorption
  • D、RF signal attenuation
  • E、Fresnel zone impedance

正确答案:B

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