差别感受性
参考答案：差别感受性：指对两个刺激量强度差别的感觉能力。
You can’t guess ______ when he was admitted by Beijing University.
A．how he was happy
B．how happy was he
C．how happy he was
D．he was how happy
泵在设计过程中轴功率（）有效功率。
A、大于
B、小于
C、不大于
D、等于
