稳定流动工质,可逆膨胀输出的最大有用功,就是焓㶲。
A. 对
B. 错
What does the word "class" in "...human being may be divided into three classes"(Line 6, para. 1) mean?
A. types
B. groups
What does the word "industrious" mean in "It may also be said that rational, industrious, useful human beings are divided into two classes"? (Line 1, para.2)
A. companies
B. hard-working
What structure is applied in Para.2?
A. general-specifical--general
B. general-specific
C. specifical--general