在液压系统中，由于油液本身有（）的能力，所以系统工作比较平稳。
A.流动
B.凝结
C.吸振
D.润滑
参考答案：C
China _______ rapid progress in space technology in the last 10 years.
A．made
B．has made
C．had made
D．were making
Most students can go to college for further in our city. [ ]
A. education
B. information
C. technology
D. science
