问答题 优惠成交法，即是推销人员利用优惠的____来促成顾客立即购买推销品的成交方法。
单项选择题 Many people in the north are fond of liquors. I think it （ ） with the climate.A.does something as toB.has something to doC.is something thatD.as that something is
单项选择题 In a certain digital waveform, the period is twice the pulse width .The duty cycle is 在某一数字波形中，周期是脉冲宽度的二倍。则其占空比为：