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问题 单项选择题

高压比轴流压气机在（）时更易发生喘振。

A、高转速时

B、满速时

C、中转速

D、低转速

答案

参考答案：D

单项选择题

Windows2000是基于下列( )版本的Windows操作系统发展而来的

A．Windows98

B．WindowsMe

C．Windows XP

D．Windows NT
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单项选择题

Justin Banks just won the lottery and is trying to decide between the annual cash flow payment option and the lump sum option. Justin can earn 8% at the bank and the annual cash flow option is $ lO0000/year, beginning today for 15 years. What is the annual cash flow option worth to Justin today（）

A. $ 855947.87.

B. $1500000.00.

C. $ 924423.70.
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