【简答题】Passage 1 Several times each year the Queen gives afternoon tea parties at which guests are served tiny cakes filled with cream from her own cows. Cakes and sandwiches are brought in by footmen, yet y...
【简答题】Cultural rules determine every aspect of food consumption. Who eats together defines social units. For example, in some societies, the nuclear family is the unit that regularly eats together. The anth...
【简答题】下列选项叙述错误的是( )A. 在不致引起误解时,过渡线、相贯线、截交线允许简化,可用圆弧或直线代替非圆曲线,还可采用模糊两法表示相贯线。 B. 与投影面倾斜角度小于或等于30°的圆或圆弧.其投影可用圆或圆弧代替,而不必画椭圆。 C. 当图形不能充分表达平面时,可用平面符号(相交的两条细实线)表示。 D. 当机件上有多个相同结构(如孔、槽、齿等)且按一定规律分布时,只需画出几个完整的结...