学习者根据一定的评价标准进行自我评价和自我监控来强化相应学习的行为属于（）。
A.直接强化
B.间接强化
C.自我强化
D.替代性强化
参考答案：C
If you had seen a doctor, you much better now. [ ]
A. are
B. will be
C. would be
D. would have been
镀层厚度一般用（）
A.微米
B.米
C.分米
D.毫米
