俄国土壤学家道恰耶夫最早把土壤剖面分为三个发生层，即表土层、淀积层（聚积层）、（）
参考答案：母质层
下列说法正确的有（）
A.科学术语、专有名词一般都是单义的
B.本义是一个词有历史可查的最早意义
C.在许多情况下，词的基本义就是它的本义
D.引申义是由基本义派生、发展出来的意义
Which of the following discharge instructions should the nurse give the parents of an infant with a temporary colostomy
A．Flush the stoma with tap water at least once a day.
B．Allow the diaper to absorb the colostomy drainage.
C．Give the infant plenty of liquids to drink.
D．Expect the stoma to become dusky red within 2 weeks.
