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温比（temperature ratio）
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考题
Scarcely _____ above 35℃ in summer in this city.A. the temperature goesB. does the temperature goC. the temperature wentD. did the temperature go
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Sweat damage in a hatch full of canned goods in cartons will occur when the ______．A.Air temperature is higher than the temperature of the cargoB.Air temperature is lower than the temperature of the cargoC.Dew point is higher than the temperature of the cargoD.Dew point is lower than the temperature of the cargo
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Which of the following is the definition of CAS latency？（）A、 CAS latency is the ratio between the column access time and the clock cycle time.B、 CAS latency is the ratio between the row access time and the clock cycle time.C、 CAS latency is the ratio between the column access time and the data burst transfer time.D、 CAS latency is the ratio between the row access time and the data burst transfer time.
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在UPS电源中，“逆变器散热片的温升过高自动关机”的专业英语为（）。A、High-temperature shutdownB、Over-temperature shutdownC、Up-temperature shutdownD、Under-temperature shutdown
考题
问答题If there are only red, blue, and green marbles in a jar, what is the ratio of red to blue marbles? (1) The ratio of red to green marbles is 2:3. (2) The ratio of green to blue marbles is 6:5.
考题
单选题A smoking burner with a pulsating flame in auxiliary boiler, is an indication that the（）A
fuel oil supply temperature is normalB
burner electrode is incorrectly positionedC
fuel／air ratio is incorrectD
ignition current is too low
考题
单选题How are the pressure and temperature affected in a diesel engine cylinder during compression?（）A
Pressure and temperature decreaseB
Pressure and temperature increaseC
Pressure decreases and temperature increasesD
Pressure increases and temperature decreases
考题
单选题If the compression ratio is increased on any diesel engine, （）A
the expansion ratio will decreaseB
combustion will be slowed downC
thermal efficiency will decreaseD
thermal efficiency will increase
考题
单选题Indications of （）are loss in power and irregular running of the engine, high exhaust temperatures of corresponding unite, high local temperature in scavenge trunk, surging of turbocharger, and sparks and smoke emitted from scavenge drains.A
a crankcase explosionB
a scavenge fireC
abnormal compression ratio
考题
单选题For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?（）A
An increase in compression ratio will increase the ignition lagB
An increase in compression ratio will decrease the ignition lagC
A decrease in compression ratio will decrease the ignition lagD
A decrease in ignition lag will increase the compression ratio
考题
单选题In terms of pressure and temperature in the refrigerant in the compressor, what happens to the primary?（）A
its pressure and temperature are both loweredB
its pressure and temperature are both raisedC
its pressure is lowered and its temperature is raisedD
its pressure is raised and its temperature is lowered
考题
单选题The ratio of the height of a vessel’s rudder to its width is referred to as the（）.A
aspect ratioB
constriction ratioC
rudder ratioD
steering ratio
考题
单选题Ambient temperature is the （）.A
amount of temperature rise with no loadB
temperature of the compartment where the motor is locatedC
normal operating temperature, less the room temperatureD
amount of temperature developed by an operating motor
考题
单选题Cloud formations are minimal when the（）.A
surface temperature and temperature aloft are equalB
surface temperature and temperature aloft differ greatlyC
barometric pressure is very lowD
relative humidity is very high
考题
单选题Which of the following relationships should occur between the temperature developed in a combustion space, and the compression ratio of the engine?（）A
Higher compression ratios create higher temperatureB
Higher temperatures create higher compression ratiosC
low temperatures create higher compression ratiosD
Higher compression ratios create low temperatures
考题
填空题The ratio of a to b is the same as the ratio of 1.4 to 7. If a＝14, what is the value of b?____
考题
单选题If a diesel engines exhaust temperature is abnormally high, the cause could be（）A
too light of a loadB
injection timing is too earlyC
overloading of the engineD
too low of a compression ratio
考题
单选题Higher than normal temperature air passing through the intake of a diesel engine will result in（）A
greater overall efficiencyB
greater fuel economyC
lower horsepowerD
lower compression ratio
考题
单选题After a cold front passes，the barometric pressure（）.A
drops，and the temperature dropsB
drops，and the temperature risesC
rises，and the temperature dropsD
rises，and the temperature rises
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