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问题 多项选择题

建筑工程中，混凝土结构的质量问题主要有（）

A.蜂窝

B.露浆

C.露筋

D.孔洞

E.麻面

答案

参考答案：A, C, D, E

单项选择题

An analyst does research about gross profit margin and gathers the following information about a company in 2012:
·Average inventory is $2000
·Ending inventory of the year is $2500
·Total revenue is $20000
·Inventory tumover ratio is 5.5
·Tax rate is 40%
The gross profit margin for the company is closest to:

A. 27%
B. 31%
C. 45%
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问答题 简答题

运用过程教学的基本任务是什么？
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