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【多选题】
与大气组成相比，土壤空气组成的特点为A.
CO2高于大气
B.
O2低于大气
C.
水汽高于大气
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皮皮学刷刷变学霸
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【单选题】Classic of the Way and Virtue was first introduced into _________ as early as the 15th century and has been one of the most translated philosophical works of ancient China.
A.
13 th
B.
14 th
C.
15 th
D.
16 th