汽轮机按工作原理可分为冲动式、反动式、冲动反动联合式三种。
参考答案：对
在横线里填上“＞”、“＜”或“=“．
14×70______140×7
32×20______10×49
50×69______59×60
198×40______7310+10
280×30______29×300
46×30______23×60．
Choose the correct structure of the sentence“Millie gave Amy a book .”
A．S + V + O
B．S + V + DO
C．S + V + IO + DO
D．S + V + DO + OC
