【判断题】【消耗次数:1】
吸湿和脱湿过程中土壤水分特征曲线的差异表现为土壤吸水容易、脱水难
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相关题目
【单选题】 关于土壤水分特征曲线,表述有问题的是()
①  它不能反映不同质地土壤的持水性和土壤水分的有效性
②  它是土壤水的能量指标与数量指标的关系曲线
③  最常用的是半对数坐标曲线
④  可利用它进行土壤水吸力和含水率之间的换算
【单选题】 潮湿土壤水分蒸发主要决定于()。
①  土壤湿度
②  空气湿度
③  土壤质地
④  土壤温度
【多选题】 下列不属于从土壤水能态形式测定土壤水分的方法有()
①  A负压计
②  B取土烘干法
③  C蒸渗仪法
④  D时域发射仪(TDR)法
【多选题】 下列不属于从土壤水能态形式测定土壤水分的方法有()
①  A负压计
②  B取土烘干法
③  C蒸渗仪法
④  D时域发射仪(TDR)法
【多选题】 雨林中土壤贫瘠的原因是()
①  A.有机质分解和养分再循环旺盛,土壤缺乏养分积累和补充
②  B.气候高温多雨,地表径流和淋溶作用带走养分
③  C.雨林植被的光合作用强烈
④  D.岩石风化所释放的养分不足
【单选题】 下列土壤孔隙所吸附的土壤水,有效性最高的是()。
①  A.非活性孔隙
②  B.通气孔隙
③  C.毛管孔隙
④  D.无效孔隙
【单选题】 在土壤有机质的转化过程中,最重要的土壤生物是
①  A植物根系
②  B土壤动物
③  C土壤微生物
④  D土壤昆虫
【单选题】 对植物生长有效的土壤含水量范围对应的土壤水势范围为()
①  -3~-15bar
②  -3~-31bar
③  -1/3~-31bar
④  -1/3~-15bar
【多选题】 《国务院办公厅关于加强气象灾害监测预警及信息发布工作的意见》的要求,强化()水资源开发利用和保护重点区旱情监测,加密布设土壤水分、墒情和地下水监测设施。
①  粮食主产区
②  重点林区
③  居民生活区
④  生态保护重点区
【多选题】 土壤自净是指土壤本身通过(),而使土壤污染物浓度降低的过程。
①  A.吸附
②  B.分解
③  C.迁移
④  D.转化
随机题目
【单选题】 The match was cancelled because most of the members __________ a match without a standard court.
①  objected to having
②  objected to have
③  were objected to have
④  were objected to having
【单选题】 - Shall we sit up here on the grass or down there near the water?
①  I’d rather stay here if you don’t mind
②  Sorry, I don’t like neither
③  Certainly, why not?
④  Yes, we like these two places
【单选题】 He said he would continue a support us _____ we didn’t break the rules.
①  as well as
②  as soon as
③  as far as
④  as long as
【单选题】 Can I have a look at your passport?
①  It is here
②  Here is it
③  Here you are
④  No, you can’t
【单选题】 Her sun – tanned face suggested that she __________ in excellent health.
①  be
②  is
③  was
④  were
【单选题】 Yesterday was my birthday. My mother .
①  made a cake to me
②  made a cake me
③  made for me a cake
④  made me a cake
【单选题】 That probably explains why public opinion is broadly __________ euthanasia (安乐死), or at least certain forms of it.
①  in relation to
②  in contrast to
③  in excess of
④  in favor of
【单选题】 Young children often can’t __________ between TV programs and commercials.
①  separate
②  distinguish
③  compare
④  contrast
【单选题】 Alice is a __________ person and never makes any unreasonable demands.
①  sensible
②  sensitive
③  severe
④  solemn
【单选题】 People are spending more of their income on goods such as cars and household ________ .
①  facilities
②  appliances
③  instruments
④  equipment