土允许水透过的性能称为土的渗透性。
参考答案：对
You can’t imagine what great difficulty I had _______ my father to agree to my plan for the holiday.
A．persuading
B．persuaded
C．to persuade
D．persuade
下列属于通货膨胀的经济现象是( )。
A．需求扩张
B．存贷增加
C．价格上涨
D．价格下降
