【判断题】根部吸收的矿质元素主要通过木质部向上运输,也能横向运输到韧皮部后再向上运输。
【判断题】根部吸收的矿质元素主要通过本质部向上运输,也能横向运输到韧皮部后再向上运输。
【简答题】根部吸收的矿质元素向上运输主要通过 ,也可横向运到 后再向上运输。
【单选题】Suppose country A, a labor-abundant country, produces only wheat and cloth. The following equations illustrate the prices and costs of wheat and cloth in the country, where the numbers indicate the am...
A.
purchase more of both cloth and wheat than in the absence of trade
B.
purchase more wheat but less cloth than in the absence of trade.
C.
purchase less of both cloth and wheat than in the absence of trade.
D.
purchase more cloth but less wheat than in the absence of trade
【单选题】Suppose country A, a labor-abundant country, produces only wheat and cloth. The following equations illustrate the prices and costs of wheat and cloth in the country, where the numbers indicate the am...
A.
the real income of the landowners will increase but that of the laborers will remain unchanged.
B.
the purchasing power of the laborers will increase but that of the landowners will decline.
C.
the real income of both the landowners and the laborers will decline.
D.
the purchasing power of both the landowners and the laborers will increase.
【单选题】下列瀑布类型按照瀑布口的形状划分的是()
【判断题】根部吸收的矿质元素主要通过本质部向上运输,也能横向运输到韧皮部后再向上运输。