有位菜农收获了一个重5公斤的大萝卜，促进这个萝卜生长迅速的物质主要来自土壤中的[]A．氮肥B．磷肥C．钾肥D．硼肥-八年级生物

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• Generally speaking, if ______ strictly following the instructions, the electric bike is not as dange
• 参观沈阳世博园的同学对几株上面结满了巨大番茄的“番茄树”啧啧称奇，这些“番茄树”不是种植在土壤里，而是种植在富含营养液的水箱里。采用的这项生物技术是[]A．组织培养B．无土-七年级生物
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