问题
填空题
螺杆泵采油井的合理工作状态就是要保证泵的排量不能较大幅度地超过油井的产量,否则有()现象发生。
答案
参考答案:抽空
螺杆泵采油井的合理工作状态就是要保证泵的排量不能较大幅度地超过油井的产量,否则有()现象发生。
参考答案:抽空
Li Ping is a Grade Eight student in Zhenjiang Sunshine Secondary School.The table below is his mid-term self-assessment(自我评价).He draws faces to show his progress: ![]() ![]() ![]() Read the table and find out how well Li Ping is doing.
|