训练有素的驾驶员可以一边驾车一边谈话,这属于()
A.选择性注意
B.持续性注意
C.分配性注意
D.调节性注意
E.指向性注意
参考答案:C
铺床时两下肢前后或左右分开并屈膝的目的是()
A.利用杠杆作用而省力
B.扩大支撑面
C.降低重心
D.用最小量的肌力作功
E.尽量使用多肌群
Kristen Chandler, CFA, has been doing research about different types of goods. Which of the following goods has a positively sloped demand curve as a result of the negative income effect overweighting the positive substitution effect()
A. Veblen.
B. Giffen.
C. Inferior.