【单选题】牌号 08F中,08表示其平均含碳量为( A )
【单选题】Water formation volume factor ( ) 1.
【单选题】牌号“45钢”中的数字“45”表示该材料中碳的含量为 45。
【判断题】The marginal product of factor 1 is the ratio of output to the amount of factor 1.
【多选题】牌号为45Mn2的钢,其中数字表示()。
【多选题】Land, as a factor of production, may include ( )。
A.
the space occupied to carry out any production process, e.g. space for a factory
B.
the basic resources within land, sea or air which can be extracted, e.g. coal
C.
soil which can be used for agriculture
D.
holders of materials (pipes, vessels, containers etc.)
【单选题】1949年底,毛泽东访问苏联的真实目的是:()
【单选题】牌号 08F中,08表示其平均含碳量为( )