题目内容

Please give the full words of the abbreviations.JFETMESFETHEMTMODFET2DEG

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A JFET is a three-terminal device which is （）.

A. current-controlled device
B. voltage-controlled device

For a MESFET, the contact between the gate and channel is ( ).

A. Ohmic contact
B. Schottky contact
C. Hetero contact

The band gap of AlGaAs is ( ) than that of GaAs.

A. larger
B. smaller
C. as same as

The mobility of GaAs is ( ) than that of Si.

A. smaller
B. as same as
C. larger