【判断题】把持中国的海关,是外国侵略者控制中国政治的重要手段之一
【单选题】A company can rent one of two copying machines. The first costs $34 a month to rent and costs an additional 2 cents per copy to use. The second costs $107 a month to rent and an additional 1 cent per ...
【单选题】自某国发往 IATA业务一区、二区、三区的运价( )
【单选题】( )是我国进行对外货物买卖业务关系最大的一项国际条约。
【单选题】A 150 cm length of string is tied around a book measuring 30 cm x 20 cm x 2 cm asshown in the diagram. After knotting and tying a bow, 24 cm of string was left over. A second piece of string, also 150...
【单选题】A company can rent one of two copying machines. The first costs $34 a month to rent and costs an additional 2 cents per copy to use. The second costs $107 a month to rent and an additional 1 cent per ...
【单选题】由上题已知条件,在甲和乙成交时,商品的交换比例可能是
C.
X 与 Y 之交换比例大于1/3 ,小于1/2
【单选题】对于一台实际变压器,原边的额定电压为440V 。当原边所加电压为额定值时,副边开路电压为110V ;随着负载的增加,副边的电流达到额定值时,副边的电压为105V,则该变压器原,副边的匝数比为——。
【单选题】若星光的波长按550 nm (1 nm = 10 -9 m)计算,孔径为 127 cm的大型望远镜所能分辨的两颗星的最小角距离dq(从地上一点看两星的视线间夹角)是: