They were up very late because______.
A.it was Sunday morning
B.they were not very sleepy
C.they were preparing for the dinner
D.they saw the great fire start
第4题
废气涡轮机的理想循环由两个______过程和两个______过程组成。
A.定温/绝热
B.定压/绝热
C.多变/定压
D.定容/绝热
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