Satellites were launched () low orbit for weather and military applications.
第1题:
A、inventory
B、sacrifice
C、dripping
D、clear-cut
第2题:
Nother matter how low you consider yourself ,there is always someone _________you wishing
They were that high.
A. getting rid of
B. getting along with
C. looking up to
D. looking down upon
第3题:
根据下列材料请回答 31~35 题:
A
Now satellites are helping to forecast the weather.They are in space,and they can reach any part of the world.The satellites take pictures of the atmosphere(大气),because this is where the weather form.They send these pictures to the weather stations.So meteorologists(气象学家)can see the weather of any part of the world.From the pictures,the scientists can often say how the weather will change.
Today,nearly five hundred weather stations in sixty countries receive satellite pictures.When they receive new pictures,the meteorologists compare them with earlier ones.Perhaps they may find that the clouds have changed during the last few hours.This may mean that the weather on the ground may soon change,too.In their next weather forecast,the meteorologists can say this.
So the weather satellites are a great help to the meteorologists.Before satellites were invented,the scientists could forecast the weather for about 24 0r 48 hours.Now they can make good forecasts for three or five days.Soon,perhaps,they may be able to forecast the weather for a week or more ahead.
第 31 题 Satellites travel______.
A.in space
B.in the atmosphere
C.above the ground
D.above space
第4题:
Satellites were launched()low orbit for weather and military applications.
A.on B.around C.in D.with
第5题:
The GPS system was designed for ______ satellites.
A.3
B.12
C.18
D.24
第6题:
Which of the following is a diplexer used for?()
第7题:
inflate the liferaft on deck
roll the liferaft over the side
go to another liferaft station
get a saw and cut the liferaft free
第8题:
system was overcharged with refrigerant
system was low on refrigerant
suction valves were leaking slightly
relief valve was leaking slightly
第9题:
one
two
three
four
第10题:
there were no conventional computers
the cost of the equipping and operating was sky-high
there were no difficulties in data processing
there were not enough meteorologists
第11题:
always move slowly
are in one place only
sometime move sometime don‟t move
are synchronizing with the movement of the earth
第12题:
they could get a gift when the store opened
they wanted to own the iPad as early as they can
the price of the iPad was low at first
there were a few iPads on sale
第13题:
A、again and again
B、all the time
第14题:
此题为判断题(对,错)。
第15题:
Why do we use the weather satellites to take pictures of the atmosphere?Because______.
A.the weather satellites can do it easily
B.clouds form. there
C.the weather forms there
D.the pictures can forecast the weather
第16题:
The discount houses were first established in that period of time ________ people‘s purchasing power was low. A. which B. that C. when D. where
第17题:
第18题:
in the late 1970s
between 1980 and 1985
in the late 1980s
in the early 1990s
第19题:
system was overcharged with refrigerant
high pressure switch was improperly adjusted
expansion valve strainers were fouled
suction valves were leaking slightly
第20题:
We were greatly encouraged by the news of China’s having launched another man-made satellite.
His wish is everyone’s having a good time.
I saw an old man getting on the bus.
The smiling boy needs a pen bought by his mother
第21题:
on
around
in
with
第22题:
第23题:
While a fix can be generated by signals received from two satellites,three satellites are necessary for reliable accuracy
The satellites are in equatorial orbits around the earth about 60°of longitude apart
The satellite navigation system determines a fix by measuring the doppler shift of the radio signals from the satellite
The ship's receiver cannot begin processing data until the antenna locks onto the satellite and starts continuous tracking