单项选择题

马尾松是（）。

A.喜肥树种
B.中性树种
C.耐瘠树种
D.耐荫树种

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(句子释义)My mother reached into her bottomless supply of maxims and told Doris,“An apple a day keeps the doctor away.”（）
A.My mother took out a book, which provides a large number of maxims.
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C.My mother always had a book of quotations within easy reach.
D.My mother was constantly supplied with sayings and quotations.

A.”（）
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材质与管径一定的管道，确定管壁厚度的主要依据是________的大小。

A.介质流速
B.许用应力
C.工作压力