试题与答案

降低初温,其它条件不变,汽轮机的相对内效率()。A、提高; B、降低; C、不变;

题型:单项选择题

题目:

降低初温,其它条件不变,汽轮机的相对内效率()。

A、提高;

B、降低;

C、不变;

D、先提高后降低。

答案:

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