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【简答题】
某考察队在内蒙古巴丹吉林沙漠东南部发现了湖泊与高大沙山共存的奇观。根据资料，结合所学知识，回答下列问题。 资料一：巴丹吉林沙漠及其周边环境示意图 资料二：该地全年盛行西北风、西风，年降水量小于80mm，蒸发量大于3500 mm。广泛分布着平均高达 200~300m的沙山。沙区总面积中，湖泊群约占10%；面积大于1km 2 的湖泊有5个，严冬也不结 冰。 资料三：考察队在沙山中发现了保存完好、未曾移动的植物根管结核化石，经测定年龄在4000年以上。 同时发现沙山内部含水量较高。 资料四：经测定，湖泊水的理化指标与深层断裂带的地下水相近，与周边地表水差异较大。 （1）该地沙山是固定的还是流动的？说明判断依据。 ________________________________________________________________________________________ （2）该地湖泊冬季不结冰的原因是__________________________________________________________。 （3）分析该地补给水的各种可能来源，并给出主要来源及其判断依据。 ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________
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【单选题】_________earlier，I might have done that in a totally different way．A.I have been told###SX
A.
_________earlier，I might have done that in a totally different way． A.I have been told
B.
I were told
C.
Had l been told
D.
Had I told
【单选题】I want to buy that kind of cloth because I _____ the cloth _____ well.
A.
have told; washes
B.
have been told; is washed
C.
was told; washed
D.
have been told; washes
【单选题】I ______ something about him, but I do not know much.
A.
told
B.
had been told
C.
have been told
D.
have told
【单选题】I want to buy that kind of cloth because I _____ the cloth _____ well.
A.
have been told; washes
B.
have told; washes
C.
was told; washed
D.
have been told; is washed
【单选题】在坐标原点放一正电荷Q,它在P点(x=+1,y=0)产生的电场强度为 .现在,另外有一个负电荷-2Q,试问应将它放在什么位置才能使P点的电场强度等于零?
【单选题】I want to buy that kind of cloth because I ＿＿＿＿＿ the cloth ＿＿＿＿ well.
A.
have told； washes
B.
have been told； washes
C.
was told； washed
D.
have been told； is washed
【单选题】在坐标原点放一正电荷Q，它在P点（X=+1，Y=0）产生的电场强度为 现在，另外有一个负电荷-2Q，试问应将它放在什么位置才能使P点的电场强度等于零？（）
A.
A
B.
B
C.
C
D.
D
E.
E
【单选题】3在坐标原点放一正电荷 Q ,它在 P 点 ( X=+1 , Y=0 ) 产生的电场强度为 ,现在,另外有一个负电荷 -2Q ,试问应将它放在什么位置才能使P点的电场强度等于零?
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【单选题】在坐标原点放一正电荷Q,它在P点(x=+1,y=0)产生的电场强度为 .现在,另外有一个负电荷-2Q,试问应将它放在什么位置才能使P点的电场强度等于零?