题目内容
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[主观题]
若HMI发“COMBUSTION TROUBLE”报警，该报警为()。
若HMI发“COMBUSTION TROUBLE”报警，该报警为（)。
A.PROCESS ALARM
B.HOLD LIST ALARM
C.DIAGNOSTIC ALARM
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.PROCESS ALARM
B.HOLD LIST ALARM
C.DIAGNOSTIC ALARM
如果结果不匹配，请 联系老师 获取答案
更多“ 若HMI发“COMBUSTION TROUBLE”报警，该…”相关的问题
Rocket fuels are more explosive than methane gas because of ______.
A．the temperature at which combustion takes place
B．the degree of oxidation accomplished for the combustion process
C．the location of the combustion
D．the greater burning velocity
A．the combustion of gasoline releases photo chemically active hydrocarbons
B．the combustion of gasoline involves an intricate series of reactions
C．gasoline molecules have fewer carbon-carbon bonds
D．gasoline is a carbon-based fuel with smaller molecules
Which of the following could not be defined as combustion？
A．A quietly burning flame.
B．An explosion.
C．A radiator giving off heat.
D．The drying of oil-based paint.
A steady flame in a gas burner is the result of ______.
A．a burning velocity equal to the combustion wave
B．fuel being supplied at the same rate as the combustion wave
C．fuel being supplied at a higher rate than that of the burning velocity
D．a low combustion wave
A typical combustion process is the burning of gasoline in an automobile engine. The vaporized fuel is mixed with air, compressed in the engine's cylinder, and ignited by a spark. As the fuel flame up, the heat produced flows into the adjacent layer of unburned fuel and ignites it. In this way a zone of fire spreads throughout the fuel mixture is called a combustion wave.
The speed at which such a combustion wave travels through a fuel mixture is called the burning velocity of the mixture. The burning velocity of a gas such as methane quietly burning in air is only about one foot per second. By comparison, the burning velocity of more reactive combinations such as the rocket Fuels, hydrogen and fluorine, can be hundreds of feet per second.
If the fuel flows at the same speed as the combustion wave, the result is a stationary flame, like the one in your kitchen gas burner. In the kitchen burner a jet of gas mixed with airflows from the opening in the head of the burner. If the velocity of the fuel mixture flowing from the opening is greater than its burning velocity, the flame blows out.
In jet engines speeding through the air at 500 to 600 miles per hour, the engine's flame is sometimes blown out by the blast of air entering the combustion chamber at high speeds. Jet pilots call this condition "flameout".
Combustion can sometimes occur very slowly. A familiar example of slow combustion is the drying of ordinary oil-based paint. In this chemical reaction, called oxidation, the oxygen in the air reacts with the drying oil in the paint to provide a tough film. The linseed oil molecules link together, forming an insoluble coating.
How can the chemical reaction involved in such a quiet process as the drying of paint also produce spectacular flames and explosions？ The main difference between the two is the temperature at which they occur.
At lower temperatures the reaction must take place over a long time. The heat which is slowly produced is dissipated to the surroundings and does not speed up the reaction. When the heat produced by the low-temperature reaction is retained instead of being dissipated, the system breaks into flame.
In a flame or explosion, the reactions are extremely fast. In many chemical processes, however, such a rapid oxidation process would be extremely destructive.
Which of the following states the major difference between oxidation and fire？
A．Their burning velocities differ in rate.
B．Oxidation is a chemical reaction while fire is a physical reaction.
C．Oxidation does not create heat.
D．They occur at different temperatures.
A．6.09%
B．5.88%
C．6.25%
D．6.41%
若数据链路的发送窗口限度(尺寸)为4，在发送3号帧，并接收到2号帧的确认帧后，发送方还可连续发几帧？请给出可发帧的序号。
A．单极性归零码
B．双极性归零码(⊙o⊙)
C．单极性不归零码
D．双极性不归零码
