单项选择题

螺杆泵是依靠螺杆旋转产生的离心力而输送液体的泵，故属叶片式泵。（）
A、正确
B、错误

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Please make judgement on the correctness of the following illustration.
The basis of depreciation is: a PPE, after years of using, will be devalued, because its fair value decreases.
正确
错误

答案：错误

单项选择题

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B.
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