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【多选题】
属于重于空气的动力驱动的航空器有 [1分]A.
飞艇
B.
扑翼机
C.
旋翼机
D.
滑翔机
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】When there is a shortage in a market,
A.
there is downward pressure on price.
B.
there is upward pressure on price.
C.
the market could still be in equilibrium.
D.
the price must be above equilibrium.
【单选题】When a country's labor market is in equilibrium in the specific factors model, the wage rate
A.
will be the same in both sectors.
B.
will be higher in the export-competing sector.
C.
will be higher in the import-competing sector.
D.
will be higher in the sector where product price is higher.
E.
will be higher in the sector where product price is lower.
【单选题】When there is a surplus in a market,
A.
there is upward pressure on price.
B.
there is downward pressure on price.
C.
the market could still be in equilibrium.
D.
there are too many buyers chasing too few goods.
【简答题】二极管正向偏置时,其正向导通电流注意主要由 的扩散运动形成。
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