额定功率下,节流调节比喷嘴调节更()。
参考答案:经济
已知全集U=R,集合A={x|lg(x-2)<1},B={x|x2-x-2<0},则A∩∁UB=______.
China rank ______ in the 2008 Beijing Olympic Games and more and more countries _______
China as a friendly and powerful country. [ ]
A. the first; rank
B. first; rank
C. the first; regard
D. first; suppose