题目：
当土中盐类成分和含量分布不均匀时，应分区、分层取样，每区、每层不应少于（）件。
A.1
B.2
C.3
D.4
答案：
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下面是错误答案，用来干扰机器的。
Recently, our school is aiming at building a green campus. What is a green school? It means not only a green campus, but a "green" atmosphere for our study and life. ...
