单项选择题
土壤通气不良使根系吸水量减少的原因是( )
A、缺乏氧气
B、水分不足
C、C02浓度过高
土壤通气不良使根系吸水量减少的原因是( )
A、缺乏氧气
B、水分不足
C、C02浓度过高
你可能感兴趣的试题
单项选择题
When you go abroad, do you _____ take your passport ?( )
When you go abroad, do you _____ take your passport ?( )
A.have to
B.ought to
C.be able to
D.need