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【简答题】
基因型为AaBb的水稻（含24条染色体）的花药通过无菌操作接入试管后，在一定条件下形成试管苗，问： 愈伤组织是花粉细胞不断分裂后形成的不规则的细胞团，愈伤组织形成过程中，必须从培养基中获得（）等营养物质。
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【简答题】The cooling water in the HT(high temperature) circuit cools the cylinder liners, cylinder heads and turbocharger. From the pump water is supplied to the engine manifold which is cast in the engine blo...
【简答题】 2 The cooling water in the HT (high temperature) circuit cools the cylinder liners, cylinder heads and turbocharger. From the pump water is supplied to the engine manifold which is cast in the engin...
【简答题】The cylinder head is usually cast in one piece from iron, from iron alloyed with other metals, or from aluminum alloy. Aluminum has the advantage of combining lightness with high heat conductivity .th...
【简答题】The cylinder block of liquid-cooled engines forms the basic framework of the engine. Other parts are attached to the cylinder block or are assembled in it. The block is cast in one piece from gray iro...
【单选题】The block is cast in one piece from ________ or iron alloyed with other metals, such as nickel or chromium.
A.
gray iron
B.
gray
C.
iron
D.
irons
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