螺杆泵采油系统根据其驱动方式的不同,可分为电动、液动和()三种类型。
A.电动和液动
B.电动和机动
C.机动
D.机动和液动
参考答案:C
指出错误并改正。
1. Can you play football and us?
A B C
( )改为
2. I like this shorts.
3. What do you want to go?
4. I don't like swim.
5. Does he has a headache?
明末,李自成提出了“均田”、“免粮”的主张,在河南提出了什么政策?