We have no idea at all ______ the economic crisis will end. [ ]A. when B. that when C. whatD. that -

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• 植物生活中需要最多的三类无机盐是（）A．氮、磷、钾B．氮、磷、铁C．氮、硫、钾D．硼、磷、锌-八年级生物
• 植物需要量最大的无机盐是（）A．氮、磷、钾B．钾、钙、镁C．铁、硼、钾D．钠、钾、铁-七年级生物
• 给庄稼、花草施肥对植物生长的意义（）A．为庄稼、花草提供充足的水分B．为庄稼、花草提供无机盐C．为庄稼、花草提供足够的有机物D．以上三项都正确-生物
• 种植农作物时，最好施用的肥料是（）A．氨肥B．磷肥C．钾肥D．农家肥-生物
• 无土栽培是指（）A．植物浸在水里的栽培B．无需无机盐的栽培C．在配制好的营养液中栽培D．浸在农家肥里的栽培-生物
• 下列蔬菜中需要含氮无机盐较多的是（）A．花生B．白菜C．番茄D．马铃薯-生物
• 某同学按如图所示方法进行了无土栽培的尝试，下列有关叙述不正确的是（）A．甲乙两装置应放在相同的适宜环境中B．甲植株生长的好的原因是土壤浸出液中含有植物生长所需的无机盐C-生物
• 植物生长需要量最多的无机盐是（）A．含氮、磷、钾的无机盐B．含氮、磷、铜的无机盐C．含钙、磷、钾的无机盐D．含氮、锌、钾的无机盐-生物
• 枝条是由芽发育成的，植株生长需要量最多的无机盐是氮、磷、______．-生物
• 无土栽培是栽培植物的新技术，青菜在无土栽培的培养液中也能茁壮成长．下列有关叙述中，不正确的是（）A．培养液的浓度大小不会影响青菜对水的吸收B．配制的培养液的主要成分与土-生物
• 小刚栽种了一棵菠菜，过了一段时间发现植株矮小，新叶淡绿，老叶黄色枯焦，这最可能是缺少了[]A．含氮的无机盐B．含磷的无机盐C．含钾的无机盐D．含铁的无机盐-八年级生物
• 油菜“花而不实”是由于缺乏哪种无机盐[]A．缺氮B．缺磷C．缺钙D．缺硼-七年级生物
• 农民一次施肥过多，造成“烧苗”，产生这种现象的原因是[]A．土壤溶液浓度小，细胞吸水B．土壤溶液浓度大，细胞失水C．气温过高损害植物D．水分运输不畅通-七年级生物
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