【单选题】28直径为100mm的圆柱导体,若要求导体表面的磁场强度达到2400A/m,则需要的磁化电流为:( )
【单选题】将道路货物运输划分为普通货物运输和特殊货物运输的依据是货物运输的( )。
【单选题】Suppose a country begins to allow international trade in steel. Which of the following outcomes will be observed regardless of whether the country finds itself importing steel or exporting steel?
A.
The sum of consumer surplus and producer surplus increases.
B.
The quantity of steel demanded by domestic consumers increases.
C.
Domestic producers of steel receive a higher price for steel.
D.
The losses of the losers exceed the gains of the winners.
【单选题】Hypereutectiod steel’s microstructure at room temperature is( ).
【单选题】路货物运输划分为普通货物运输和特殊货物运输的依据是货物运输的( )。
【多选题】按货物运输的批量,货物运输可划分为( )。
【简答题】普通货物的运输形式包括( )。 A.整车运输 B.鲜活易腐货物运输 C.零担货物运输 D.集装箱运输