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Which security mechanism uses the concept of a realm？（）
A . Authorization
B . Data integrity
C . Confidentiality
D . Authenticatio
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If the hydrostatic release mechanism for an inflatable liferaft is not periodically serviced and becomes inoperative，it will NOT（）.
A . set the water lights on immersion
B . release the dye-marker from the liferaft
C . free the liferaft from the vessel
D . break the seal on the carbon dioxide cylinder
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The burning of fuel oil in a diesel engine having a high sodium content, will cause （）
A . corrosion and grooving of exhaust valves
B . corrosion and gumming of the fuel injection pump
C . salt deposits in the exhaust manifold
D . slag deposits in the fuel injection equipment
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Which the security mechanism uses the concept of a realm？（）
A . authorization
B . data integrity
C . confidentiality
D . authenticatio
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The main objective of mechanical practice is to help learners to absorb thoroughly the＿＿of a language item.
A . meaning
B . function
C . context
D . form
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Increasing the load on an engine equipped with a constant speed mechanical governor, will cause the engine speed to initially （）.
A . increase
B . decrease
C . fluctuate
D . remain constant
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Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.
A . 97 times greater
B . 94 times greater
C . 10 times greater
D . 2 times greater
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The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by （）
A . dirt
B . fuel oil
C . governor cooling water
D . fuel oil tar
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The quantity of cooled air delivered by an air conditioning unit should （） the sum of the quantity of air re-circulated to the unit and the quantity mechanically exhausted.
A . balance
B . not balance
C . be more than
D . be less tha
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Which statement is true about the components of a queuing mechanism？（）
A . Each subinterface has its own hardware queue and can experience congestion just like its main interface
B . Hardware queuing is only used if the software queues are experiencing congestion.
C . Hardware queues and software queues are not used concurrently.
D . The hardware queuing system always uses the FIFO queuing mechanism.
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Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?（）
A . When heated, it will move proportional to the amount the metal has lengthened or expanded
B . The pointer associated with the pyrometer scale can be made to also measure engine RPM
C . It can be utilized in exhaust manifolds and heat exchangers interchangeably
D . It can indicate temperature at a distant point from the source heat
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A large change in ambient temperature, or using an oil of a viscosity different from the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the （）.
A . pilot valve opening
B . compensating needle valve
C . compensating spring tension
D . accumulator spring tensio
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The fire of sodium is classified as（） fire.
A . Class A
B . Class B
C . Class C
D . Class D
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Which of the following protocols utilize UDP as the layer 4 transport mechanism?（）
A . TACACS
B . Telnet
C . SMTP
D . SNMP
E . HTTP
F . TFTP
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Among the basic categories of equipment, which of the following are used to convert mechanical into hydraulic energy?（）
A . The hydraulic pumps
B . Valves
C . Hydraulic cylinders
D . Hydraulic motor
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Multi Protocol Label Switching （MPLS） is a data-carrying mechanism that belongs to the family of packet-switched networks. For an MPLS label， if the stack bit is set to1， which option is true？（）
A . The stack bit will only be used when LDP is the label distribution protocol
B . The label is the last entry in the label stack.
C . The stack bit is for Cisco implementations exclusively and will only be used when TDP is the label distribution protocol.
D . The stack bit is reserved for future use.
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The mechanical efficiency of an engine （） because losses occur in the form of friction.
A . is always less than 100%
B . is always more than 100%
C . is always equal to 90%
D . is always less than 90%
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Describe the mechanisms of action of antibacterial drugs, give one example for each. （10.0分）
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Corrosion and grooving on the blade of an exhaust driven turbocharger is caused by certain components of residual fuel oilsThese components are vanadium, sodium, and＿.
A.copper
B.carbon
C.hydrogen
D.sulfur
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Boil 0.5 g of thepowdered tablets for 2 to 3 minutes with 10 mL of 5 M sodium hydroxide, cooland add an excess of 1 M sulfuric acid; a crystalline precipitate is produced.To a solution of the precipitate in water add iron (III) chloride solution R1;a _______ colour is produced.
A、turquoiseblue
B、deep violet
C、sandy brown
D、smoky grey
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According to data from the Centers for Disease Control and Prevention, the biggest source of sodium in Americans' diets is_________
A. cheese
B. bread
C. pizza
D. sandwiches
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The mechanism of edema in the homolateral arm of breast carcinoma treated with radical surgery is ( )
A:Increased capillary hydrostatic pressure due to congestion in operation; B:Increased capillary permeability due to vessel impairment in operation; C:Decreased plasma colloid osmotic pressure due to plasma loss in operation; D:Lymphatic obstruction due to removal of lymph nodes in operation; E:Increased tissue colloid osmotic pressure due to tissue damage in operation
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In esplaining the theory of relativisty the scientist states that mechanical laws that
A．A.being
B．B.they should be
C．C.care
D．D.to be
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Which one is correct of the following descriptions about the transport mechanism of macromolecular substances（）
A．Signal-regulated secretion requires the participation of clathrin, whereas continuous secretion is not required
B．The specificity of the transporter is regulated by clathrin and adaptin in the composition of the vesicles
C．Receptor-mediated transport needs protein or protein complex to associate with a specific receptor in the cell membrane
D．Insulin secretion is endocytosis
