單項(xiàng)選擇題

Operational amplifiers, used primarily in analog circuits, are characterized by（）

A.high input impedance, high gain and low output impedance
B.high input impedance, high gain and high output impedance
C.low input impedance, low gain and high output impedance
D.low input impedance, high gain and low output impedance

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單項(xiàng)選擇題

CFC refrigerants exposed to high temperature or direct flame, will decompose and may produce（）

A.methyl chloride
B.ammonia
C.hydrofluoric acid
D.ozone

單項(xiàng)選擇題

The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）

A.one valve seats upwards, while the other seats downwards
B.the reed valves used on the discharge are made substantially thicker and heavier than the suction valves
C.the suction valve springs exert a greater tension than the discharge valve springs
D.the discharge valve springs exert a greater tension than the suction valve springs

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Operational amplifiers, used primarily in analog circuits, are characterized by（）

你可能感興趣的試題

CFC refrigerants exposed to high temperature or direct flame, will decompose and may produce（）

The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）

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