噪声的传播途径有哪些（）。A.撞击传声和固体传声 B.漫反射传声_爱下问搜题

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问题单项选择题

噪声的传播途径有哪些（）。

A.撞击传声和固体传声

B.漫反射传声和固体传声

C.空气传声和固体传声

D.空气传声和漫反射传声

答案

参考答案：C

问答题简答题

采用标准成本体系有什么好处？

单项选择题

An analyst does research about opportunity cost and gathers the following information about three fixed income products available for the public:

Fixed Income Product	Interest Rate
1	3.3%
2	4.4%
2	4.4%
3	6.6%

If each fixed income product has the same maturity and default risk, the opportunity cost of investing in product 2 is closest to:（）

A. 0.0%

B. 1.1%

C. 2.2%