Tom Jackson of the United States Department of Agriculture prepared the map after the April flood. He used in-formation provided by satellites in Earth orbit.
The maps are produced from dish receivers on the satellites. Each dish receiver measures the wetness of the soil by capturing the natural release of microwave radiation from the soil. The receivers turn rapidly. This provides complete coverage of each area the satellite passes over.
Mr. Jackson and other scientists have tested Aqua’s equipment in airplanes and satellites flying over several states. Tile scientists used the tests to develop ways to change the information gathered into maps.
Mr. Jackson now plans to compare the microwave dish receiver findings with information from tests on Earth's soil. He will use instruments at Agricultural Research Service centers in four states. He also will study information provided by forty ground observation centers across the country.
Why American scientists are developing these maps7
A.To estimate the extreme weather.
B.To develop the satellite technology.
C.To improve agricultural output.
D.To learn how to change information to maps more efficiently.
第1题
新鲜血液中V因子的功能是
A.过氧化氢酶的辅基
B.脱氢酶的辅基
C.过氧化物酶的辅基
D.氧化酶的辅基
E.凝固酶的辅基
第2题
嗜血杆菌分离培养时,需要V因子是因为它是
A.高铁血红素
B.脱氢酶的辅酶
C.过氧化氢酶的辅基
D.细胞色素氧化酶的辅基
E.触酶的辅基
第5题
辅酶与辅基的差别在于
A.辅酶与酶共价结合,辅基则不是
B.辅酶参与酶反应,辅基则不参与
C.辅酶为小分子有机物,辅基常为无机物
D.辅酶含有维生素成分,辅基则不含
E.经透析方法可使辅酶与酶蛋白分离,辅基则不能
第6题
辅酶与辅基的差别在于
A.辅酶与酶共价结合,辅基则不是
B.辅酶参与酶反应,辅基则不参与
C.辅酶为小分子有机物,辅基常为无机物
D.辅酶含有维生素成分,辅基则不含
E.经透析方法可使辅酶与酶蛋白分离,辅基则不能
第7题
辅酶和辅基的差别在于
A.辅酶为小分子有机物,辅基常为无机物
B.辅酶与酶共价结合,辅基则不是
C.经透析方法可使辅酶与酶蛋白分离,辅基则不能
D.辅酶参与酶反应,辅基则不参与
E.辅酶含有维生素成分,辅基则不含
第8题
辅酶和辅基的差别在于
A.辅酶为小分子有机物,辅基常为无机物
B.辅酶与酶共价结合,辅基则不是
C.经透析方法可使辅酶与酶蛋白分离,辅基则不能
D.辅酶参与酶反应,辅基则不参与
E.辅酶含有维生素成分,辅基则不含
第9题
辅酶与辅基的区别是()。
A.辅酶参与酶反应,辅基则不参与
B.辅酶与酶共价结合,辅基则不是
C.辅酶含有维生素成分,辅基则不含
D.辅酶为小分子有机物,辅基常为无机物
E.经透析方法可使辅酶与酶蛋白分离,辅基则不能
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