第1题:
Spring tides occur______.
A.when the moon is new or full
B.when the moon and sun have declination of the same name
C.only when the moon and sun are on the same sides of the earth
D.at the beginning of spring when the sun is over the equator
第2题:
B
The word “day” has two meanings. When we talk about the number of days in a year, we are using “day” to mean 24 hours. But when we talk about day and night, we are using “day” to mean the time between sunrise and sunset. Since the earth looks like a ball, the sun can shine on only half of it at a time. Always one half of the earth is having day and the other half night. A place is moved from day into night and from night into day over and over by the spinning(旋转) of the earth. At the equator(赤道) day and night are sometimes the same length. They are each twelve hours long. The sun rises at 6 in the morning and sets at 6 in the evening. For six months the North Pole is tilted(倾斜) toward the sun. In those months the Northern Hemisphere(半球) gets more hours of sunlight than the Southern Hemisphere. Days are longer than nights. South of the equator nights are longer than days. For the other six months the North Pole is tilted away from the sun. Then the Southern Hemisphere gets more sunlight. Days are longer than night. North of the equator nights are longer than days. Winter is the season of long nights. Summer is the season of long days.
56. When the Western Hemisphere is having day, the Eastern Hemisphere is having ______.
A.both day and night B.day C.neither day nor night D.night
第3题:
All VHF marine band radios operate in the simplex mode,which means that______.
A.only one person may talk at a time
B.only two persons may talk at the same time
C.the radio only transmits
D.the radio only receives
第4题:
Which of the following regulates the amount of network traffic a single node receives in a servercluster?()
第5题:
What is system balance? ()
第6题:
Which two statements are correct about Layer 2 broadcast frames?()
第7题:
Company.com wishes to use IPAT via IP replacement in a two-node mutual cluster. Each node has two Ethernet 10/100/1000 adapters. Throughout the planning session,the customer has asked questions about subnet and VLAN requirements for the intended network topology. Which of the following best describes the network requirements?()
第8题:
Its accuracy remains the same at all latitudes
It seeks the true meridian
It can be used near the Earth's magnetic poles
If an error exists,it is the same on all headings
第9题:
only one person may talk at a time
only two persons may talk at the same time
the radio only transmits
the radio only receives
第10题:
They cost the same on a per night basis.
They involve the same activities.
They go to the same Caribbean island.
They have the same departure-point.
第11题:
第12题:
The service IP addresses must be on a separate subnet and VLAN.
The non-service and service IP addresses must be on the same subnet and on the same VLAN.
All interfaces on a node must be in different subnets. All subnets must be on the same VLAN.
One non-service and one service IP address must be on the same logical subnet. All interfaces must be on the same VLAN.
第13题:

A.255.255.255.0
B.255.255.254.0
C.255.255.252.0
D.255.255.248.0
第14题:
Which statement about the gyrocompass is FALSE ________.
A.Its accuracy remains the same at all latitudes
B.It seeks the true meridian
C.It can be used near the Earth's magnetic poles
D.If an error exists,it is the same on all headings
第15题:
In which voyage,between two points,is the rhumb line distance NOT approximately the same as the great circle distance?_____.
A.The two points are in low latitudes in the same hemisphere
B.The two points are in high latitudes in the same hemisphere
C.The two points are near the equator,but in different hemispheres
D.One point is near the equator,one point is in a high latitude,and both are near the 180th meridian
第16题:
What does the FREQ column show when running the tprof option?()
第17题:
What does the FREQ column show when running the tprof option? ()
第18题:
Which two statements about creating constraints are true? ()
第19题:
第20题:
always be nearer to the equator
always be nearer to the elevated pole
be nearer to the pole in the Northern Hemisphere and nearer to the equator in the Southern Hemisphere
be nearer to the pole or the equator depending on the latitudes of the arrival and departure positions
第21题:
第22题:
can fit any size hose
converts a stream of water into a fog
increases the amount of water reaching the fire
can spray two streams of water at the same time
第23题:
dividing walls
divided walls
dividing liners
divided jackets
第24题:
when the moon is new or full
when the moon and sun have declination of the same name
only when the moon and sun are on the same sides of the earth
at the beginning of spring when the sun is over the equator