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单选题
A yellow signal，floating in the air from a parachute，about 300 feet above the water，indicates that a submarine（）.
A
will be coming to periscope depth
B
will be coming to the surface
C
is on the bottom in distress
D
is in distress and will try to surface
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考题
It can be inferred from the passage thatA. it is necessary to keep the air-conditioning on all the timeB. it seems possible for every household to cut emissions of CO2C. the average US household produces about 3,000 pounds of CO2 a monthD. the average European household produces about 1,000 pounds of CO2 a month
考题
A light used to signal passing intentions must be an ______.A.all-round yellow light onlyB.all-round white light onlyC.all-round blue light onlyD.alternating red and yellow light
考题
A cool mass of air heads toward the United States from the upper regions of Canada and Alaska this week according to the National Weather Service.
According to the NWS a mass of cold air will drop from the Arctic regions to Canada and then the upper Midwest next week.
Temperatures across the Midwest will drop into the 60s and 70s-a sharp difference from the 80 degree and 90 degree temperatures from recent weeks. And the relatively cooler air may be felt as far East as New York and Washington
The cool breezes may be a welcome relief this time around but remember the last few times we got hit with Arctic air？
Temperatures in cities including Chicago Cleveland New York and Louisville fell into single-digit and negative territory for long stretches during the harsh winter months of early 2014. But we’re sure you remember
What’s the temperature when the report was written?A. About 60s and 70s
B. Between 60s and 90s
C. Below 60s
D. About 80s and 90s
考题
Many people use wood stoves and fireplaces to heat their homes．Scientists have become worried about the smoke that they give off．Harmful chemicals are in the smoke．The smoke is causing air pollution．The pieces of pollution,called soot,are floating in the air．They are too tiny to see．Scientists must use a microscope to see them.
Small amounts of soot are safe,but large amounts can be dangerous．The govenment wants to limit this kind of pollution．It may stop people from using their fireplaces.
The air is tested every day．When soot levels are high,more than 65 micrograms of soot per cubic meter,factories must stop making smoke．The government thinks that limit should be much lower.
Factories produce the most smoke and soot．But the government thinks that all types of burning should be limited．The soot levels from factories and homes could be limited．Home owners may have to install new wood stoves that they comply with the new law．Or,they may not be able to bum on days when the air quality is bad.
Residents of some towns are fined if they violate the burning ban．Scientists hope these new regulations will make the air cleaner and less harmful to breathe.
Why is the air quality tested every day?A.Just in case someone ask
B.Scientists like to take test
C.Scientists are not very bus
D.To keep track of pollution level
考题
Many people use wood stoves and fireplaces to heat their homes．Scientists have become worried about the smoke that they give off．Harmful chemicals are in the smoke．The smoke is causing air pollution．The pieces of pollution,called soot,are floating in the air．They are too tiny to see．Scientists must use a microscope to see them.
Small amounts of soot are safe,but large amounts can be dangerous．The govenment wants to limit this kind of pollution．It may stop people from using their fireplaces.
The air is tested every day．When soot levels are high,more than 65 micrograms of soot per cubic meter,factories must stop making smoke．The government thinks that limit should be much lower.
Factories produce the most smoke and soot．But the government thinks that all types of burning should be limited．The soot levels from factories and homes could be limited．Home owners may have to install new wood stoves that they comply with the new law．Or,they may not be able to bum on days when the air quality is bad.
Residents of some towns are fined if they violate the burning ban．Scientists hope these new regulations will make the air cleaner and less harmful to breathe.
What happens to some residents who bum too much wood?A.They could lose their home
B.They pay for the punishmen
C.They get sick from the smok
D.The fire could get out of contro
考题
The cleaner has just left,leaving an aerosol’s delightful aroma floating in the air.You ______ deeply,enjoying the sweet fragrance.A.exert
B.inhale
C.exhale
D.inert
考题
资料：We never thought we'd say this, but we'd welcome back some chilly weather.
A cool mass of air heads toward the United States from the upper regions of Canada and Alaska this week, according to the National Weather Service.
According to the NWS, a mass of cold air will drop from the Arctic regions to Canada and then the upper Midwest next week.
Temperatures across the Midwest will drop into the 60s and 70s—a sharp difference from the 80 degree and 90 degree temperatures from recent weeks. And the relatively cooler air may be felt as far East as New York and Washington.
The cool breezes may be a welcome relief this time around, but remember the last few times we got hit with Arctic air?
Temperatures in cities including Chicago, Cleveland, New York, and Louisville fell into single-digit and negative territory for long stretches during the harsh winter months of early 2014. But we're sure you remember.
What’s the temperature when the report was written?A.About 60s and 70s.
B.Between 60s and 90s.
C.Below 60s.
D.About 80s and 90s.
考题
An administrator is concerned about users utilizing the company's wireless signal with their personal laptops. Which of the following is the BEST method to use to prevent unauthorized devices from using the company's wireless network?（）A、Secure VPNB、MAC filteringC、IP filteringD、Static IP addresses
考题
Which two statements are true about broadband cable （HFC） systems？（）A、Cable modems only operate at Layer 1 of the OSI model.B、Cable modems operate at Layers 1 and 2 of the OSI model.C、Cable modems operate at Layers 1， 2， and 3 of the OSI model.D、A function of the cable modem termination system （CMTS） is to convert the modulated signal from the cable modem into a digital signal.E、A function of the cable modem termination system is to convert the digital data stream from the end user host into a modulated RF signal for transmission onto the cable system.
考题
单选题A signal derived from a controlled function and returned to the initiating point is called a/an （）.A
monitoring signalB
inverse signalC
reverse signalD
feedback signal
考题
单选题Air blowing from the intake air filter of an operating air compressor indicates （）.A
broken inlet valvesB
broken discharge valvesC
pulsations in the air distribution systemD
overloading of the air distribution system
考题
单选题Your vessel is equipped with totally enclosed lifeboats. Which statement is true when the boat is enveloped in flames?（）.A
The ventilators will automatically close by the action of fusible linksB
The motor takes its air supply from outside the lifeboat to prevent asphyxiation of the crewC
A water spray system to cool the outside of the boat is operated by a high-volume manual pumpD
An air tank will provide about ten minutes of air for the survivors and the engine
考题
单选题Too much air in the furnace of an oil-fired boiler would be indicated by （）.A
yellowish flameB
golden yellow flameC
white flameD
brilliant white flame
考题
填空题When you start running, the muscle cells bum off the ATP they have floating around in about 3 seconds.____
考题
单选题In an air conditioning system, moisture is removed from the air by（）A
filersB
separatorsC
ducted trapsD
dehumidifiers
考题
单选题A jar contains 4 red, 1 green, and 3 yellow marbles. If 2 marbles are drawn from the jar without replacement, what is the probability that both will be yellow?A
3/8B
3/28C
1/4D
3/56E
5/56
考题
单选题As the air passes through the charge air cooler, its temperature may be reduced and moisture condensed, with the condensate in danger of being carried into the engineSo a water separator should be mounted beneath the bottom part of the engine inlet manifoldA water separator is used in order to （）.A
keep the air from being carried into the engineB
keep the moisture from being condensedC
keep the danger from being carded into the engineD
take away the condensate from the air
考题
单选题The latest annex of MARPOL 73/78 is about（）A
the Prevention of Pollution by OilB
the Prevention of Pollution by Noxious Liquid Substances in BulkC
Prevention of Pollution by Garbage from ShipsD
Prevention of Air Pollution from Ships
考题
单选题In the International Code of signals，a group of three letters indicates（）.A
urgency or an emergencyB
the vessel's national identity signalC
a group from the general signal codeD
a group from the medical signal code
考题
单选题The purpose of an air compressor unloading device is to （）A
drain water from the air receiverB
drain water from the cylindersC
delay the compression process until the motor is up to speedD
check pump alignment
考题
单选题You have berthed in a area with other tank vessels. What signal is displayed by a vessel to indicate it is transferring flammable or combustible liquid cargo?（）.A
A flashing yellow lightB
A red light visible all around the horizonC
A green light visible all around the horizonD
An illuminated red and yellow caution flag
考题
单选题The color _____ from yellow through green to black.A
consistsB
constitutesC
composesD
ranges
考题
单选题A yellow signal floating in the air from a small parachute，about 300 feet above the water，would indicate that a submarine（）.A
has fired a torpedo during a drillB
is about to rise to periscope depthC
is on the bottom in distressD
is disabled and unable to surface
考题
单选题You receive a call from the MSA OF CHINA addressed to all stations. The call begins with the words Pan-Pan (3 times). Which type of emergency signal would this be?（）.A
Safety signalB
Urgency signalC
Distress signalD
Red alert signal
考题
单选题As for a oil-fired boiler too much air would indicated by （）.A
yellowish flameB
golden yellow flameC
milky flameD
brilliant white flame
考题
单选题A light used to signal passing intentions must be an（）.A
alternating red and yellow lightB
alternating white and yellow lightC
all-round white or yellow lightD
all-round white light only
考题
单选题A light used to signal passing intentions must be an （）.A
all-round yellow light onlyB
all-round white light onlyC
all-round blue light onlyD
alternating red and yellow light
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