【单选题】I _____ on a sofa because my grandparents have come for the weekend.
【单选题】I ________ on a sofa because my grandparents have been here to spend the weekend.
【简答题】I ________ on a sofa because my grandparents have been here for the weekend. [ ] A . slept B. was sleeping C. have slept D. am sleeping
【单选题】已知2FSK信号的传码率为2000波特,所用的两个载波频率分别为2000Hz和4000Hz,则该信号的第一零点带宽为( )Hz。
【单选题】My grandparents have lived in a town near Nanjing . They enjoy their life in the town. A.for many
A.
My grandparents have lived in a town near Nanjing ____. They enjoy their life in the town. A.for many years ago
【单选题】已知某商业路段的样点地价分别为1000、1200、1120、1150、1100、1300、2000、1500元/m2。则该路段样点地价的中位数为( )元/m2。
【单选题】咳痰5天,医嘱给予氧气雾化吸入治疗,。执行操作时错误的是
【单选题】患者能正确朗读文字,但不能理解文字意义属于
【简答题】简述4P组合,并结合所学知识谈谈你对市场营销的认识。