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【多选题】
土壤有机质在土壤肥力等方面上的作用及提高土壤有机质含量的最佳措施。A.
为植物生长提供养分。
B.
促进微生物活动。
C.
土壤有机质可改善土壤的物理性状，最明显的地方是改善土壤结构状况，促进土壤水、肥、气热协调。
D.
调节土壤的化学性质，调节土壤肥力状况和土壤酸碱度。
E.
可提高土壤的肥能力。
F.
有利于加速土壤矿物的风化。
G.
有助于消除土壤中农药残毒和重金属污染，有机质可络合、吸附重金属。
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举一反三
【单选题】When the young man found himself ____ in the land with so many beautiful flowers ,he felt delighted .
A.
lie
B.
lain
C.
lying
D.
lay
【简答题】He _______,delighted at the memory.
【单选题】The ( ) refers to the integration of complex physical machinery with networked sensors and software. It draws together fields such as machine learning, big data, the Internet of things and machine-to-...
A.
Industrial internet
B.
factory interne
C.
Industrial web
D.
business internet
【单选题】The authors attitude toward networked individualism can be described as______.
A.
appreciative
B.
critical
C.
regretful
D.
neutral
【单选题】He is delighted to have ___ the examination.
A.
got through
B.
look through
C.
seen through
D.
passed through
【单选题】He is delighted to have ___ the examination.
A.
got through
B.
looked through
C.
seen through
D.
passed through
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