After a short holiday, he_______ himself once more to his studies.
A.applied
B.engaged
C.managed
D.conducted
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Depression, unexplained fear and unreasonable actions are the_______of a patient with mental health problems.
A.marks
B.systems
C.symbols
D.symptoms
如果一个二极管正、反向电阻值都很大,则二极管()状态。
如果一个二极管正、反向电阻值都很小,则二极管()状态。