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【单选题】
下列会使供给曲线向右上方移动的是( )。A.
产品热销
B.
成本上升
C.
投入品价格上升
D.
生产环境的改善
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举一反三
【简答题】矩形线圈两边长分别为20cm和10cm，匝数为1000，通有0.1mA的电流，转轴通过两长边中点。把线圈置于方向向右、B=0.1T的匀强磁场中，且线圈长边与磁场平行，线圈上的电流为顺时针方向。求：
【简答题】阅读理解 One day the employees of a large company in St Louis, Missouri returned from their lunch break and were greeted with a sign on the front door. The sign said:'Yesterday the person who has been hin...
【简答题】阅读理解。 One day the employees of a large company in St Louis, Missouri returned from their lunch break and were greeted with a sign on the front door. The sign said: 'Yesterday the person who has been h...
【简答题】One day not too long ago the employees of a large company in St .Louis, Missouri returned from their lunch break and were greeted with a sign on the front door. The sign said: “Yesterday the person wh...
【单选题】Our company ________ a large number of talented employees.
A.
possesses
B.
depict
C.
took place
D.
set aside
【简答题】把长20cm、通有3A电流的直导线放入磁感应强度为1.2T的匀强磁场中,当电流方向与磁感线方向平行时,导线所受安培力是 N ;当电流方向与磁感线方向垂直时,导线所受安培力是 N 。
【简答题】有一长 20 cm 、直径 1 cm 的螺线管,它上面均匀绕有 1000 匝线圈,通以 I = 10 A 的电流.今把它放入 B = 0.2 T 的均匀磁场中,则螺线管受到的最大的作用力 F =__ 螺线管受到的最大力矩值 M =___ .
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