【判断题】By the mid-19th century, the territory of the United States had reached over 10 million square kilometers, about 9 times the size of the total area of the original thir states.
【单选题】下列关于影响根部吸收矿物质元素的条件的叙述中不正确的是()
A.
在一定范围内,根系吸收矿物质元素随土壤温度升高而增加
B.
土壤溶液碱性增强时,能增强各种金属离子溶解度,有利于植物吸收
C.
温度过高或过低都会使根系对矿物质元素的吸收减缓
D.
温度会影响酶的活性、膜的透性,从而间接影响矿物质元素的吸收与运输
【单选题】单片机上电复位后,PC的内容和SP的内容为( )。
【简答题】影响根部吸收矿物质的条件有 、 、 和 。
【简答题】阅读理解。 Sandstorms (沙尘暴) happen suddenly and have effects on large areas. One example was a sandstorm on the Western Route. It moved quickly southward (向南 ) from May 4th to 6th,1993,having effects o...
【简答题】Sandstorms( 沙尘暴 )happen suddenly and have effects on large areas. One example was a sandstorm on the Western Route. It moved quickly southward( 向南 )from May 4th to 6th, 1993, having effects on a total...
【多选题】下列关于影响根部吸收矿物质元素的条件的叙述中正确的是______。
A.
在一定范围内,根系吸收矿物质元素随土壤温度升高而增加
B.
温度过高或过低都会使根系对矿物质元素的吸收减缓
C.
温度会影响酶的活性、膜的透性,从而间接影响矿物质元素的吸收与运输
D.
土壤溶液碱性增强时,能增强各种金属离子溶解度,有利于植物吸收