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问题 单项选择题

APU引气单向活门位于：（）。

A.APU舱

B.APU隔舱

C.主轮舱后壁板

D.主轮舱前壁板

答案

参考答案：C

解答题

已知命题p：“对任意x∈[1，2]，x2-a≥0”，命题q：“存在x∈R，x2+2ax+2-a=0”若命题“p且q”是真命题，求实数a的取值范围．
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单项选择题

Question
The following information has been gathered regarding a firm that uses straight line depreciation.
Gross plant and equipment $1250000
Depreciation expense$ 235000
Accumulated depreciation $ 725000

The average depreciable life of plant and equipment is:

A．

A. 3.09 years.

B．

B. 5.32 years.

C．

C. 2.23 years.
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