【判断题】美式服务又称家庭式服务。其服务方法是服务员从厨房将烹制好的菜肴传送到餐厅,由顾客中的主人亲自动手切肉装盘,并配上蔬菜。
【单选题】In the laboratory frame of reference, the momentum of a particle of rest mass mis found to be4mc/3with c the speed of light in vacuum. What is the speed of the particle in the laboratory frame of refe...
【单选题】下面哪种抽样方法只可以用描述统计,不可以用推断统计?
【单选题】The speed of light in vacuum is about: