— ____________ are his eyes?
— They're blue. [ ]
A. What date
B. How old
C. What colour
答案:C
在比较简单的工作任务中,工厂作效率随动机的提高而( )。
A.下降
B.不清楚
C.上升
D.不变
简述热力学第二定律劳克修斯说法。