The mobility of GaAs is ( ) than that of Si.
A. smaller
B. as same as
C. larger
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For an n-type GaAs MESFET, the work function difference in the gate junction is:
A. qΦm>qΦs
B.qΦm C.qΦm=qΦs
The advantages of HEMTs include ( ).
A. high resistance
B. large carrier density
C. high carrier mobility
D. easily fabricated
What is the center of Krashen’s second language learning theory?
A. The monitor model
B. The learning/acquisition distinction
C. The affective filter hypothesis
D. The natural order hypothesis
Which is not the characteristic of acquisition?
A. Subconscious
B. Implicit knowledge
C. Similar to child’s first language acquisition
D. Formal teaching does help
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