单项选择题

以四分音符为一拍，一个全音符的时值相当于（）个四分音符。
A.

2
B.

3
C.

4
D.

5

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硼砂的水溶液呈

A．弱酸性
B．碱性
C．中性
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单项选择题

The financial connotation of net present value is
A、Net present value is a measure of the value created by undertaking an investment.
B、Net present value is a measure of the value added by undertaking an investment.
C、Net present value is a measure of the current value created or added by undertaking an investment
D、Net present value is a measure of the market value created or added by undertaking an investment.