题目内容

肺泡表面活性物质的生理作用有

A. 维持肺泡稳定性
B. 调节肺泡回缩力
C. 降低肺泡表面张力
D. 防止液体渗入肺泡

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Answer these questions using the words given and information from the article.When you move abroad......A. will it be possible to do everything right? ——No, you will _(1).B. how might you feel after two or three months? ——In a _(2). This is all part of the (3) that people follow.C. will you definitely feel, after a few months, that you've done the right thing? ——No, you might _(4)_.D. how will you feel after a few more months, if your experience is typical? ——At _(5)_.E. how will knowing what other people feel about the experience help you? —— It should (6)_.

印制电路板英文简称______

层次结构的上一层是下一层的( ),下一层是上一层的( )。

A. 抽象、求精
B. 求精、抽象
C. 细化、求精
D. 抽象、抽象

下面说法不正确的是( )。

A. 盒图支持逐步求精
B. 盒图容易造成非结构化的程序结构
C. 盒图描述的是算法
D. 盒图容易表达模块的层次结构