在逐级地实施系统脱敏训练时，每次放松后的焦虑分数必须低于（）分，才能进行下一级的训练。
A.20
B.25
C.30
D.35
参考答案：B
An analyst adjusts the historical probability of default for high-yield bonds to reflect her perceptions of changes in the quality of high-yield bonds. The analyst is best characterized as obtaining a(n);（）
A. a priori probability
B. objective probability
C. subjective probability
目视检查蓄电池电眼时，下列哪些描述是正确的（）
A、绿色表明电量小或者没有电
B、无色表明电量充足
C、黑色表明电量充足
D、黄色表明电解液到达临界状态
