单项选择题

坡度为( )的屋顶,称为坡屋顶。

A.2%~5%
B.3%~7%
C.5%~9%
D.10%~100%
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单项选择题
M: How long will it take to mail this letter to London?W: About two weeks.Q: What Call we learn from the dialogue?()

A.The man will mail a letter from London.
B.The woman works in a post office.
C.The man is a traveler.

单项选择题
由风险造成直接损失和间接损失共同构成的风险成本是( )。
A.风险损失的无形成本
B.风险损失的预防成本
C.风险损失的实际成本
D.风险损失的控制成本
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