在活动矫治器中,既可起固位作用,又可起加力及连接作用的部件是()
A.双曲簧
B.连续卡环
C.唇弓
D.塑料基托
E.箭头卡环
参考答案:C
That kind of plant can be made ______ paper and paper can be made ______ wood.
A.of; of
B.from; of
C.from; into
D.into; from
诱因论的具体形式有( )。
A.认知反应论
B.预期价值论
C.强化过程论
D.条件反射论